Solution: Chutes and Adders

Answer: DELPHI

This is by and large a normal cryptic crossword.

Across Clue Answer Explanation
2 A mangled "mon ami" can be a cleanser AMMONIA A+MONAMI*
8 I expand a tablet IPAD I+PAD
11 Tied up and spread seeds, we hear SEWED "sowed" homophone
13 Disney princess cut short after pro recipe FORMULA FOR+MULA(-n)
14 Two educator's assistants are revealed to be British later TATA TA+TA
15 Young villain at the center of panic ANI _ANI_
16 Dad hollows out woven puppet PAWN PA+W(ove)N
17 Marked as stupid having lost track of current opening answer BRANDED BRA(-i)NDE(-a)D
18 Crazy flipping king AGAG reverse GAGA
20 School period involving an old oil flask OLPE schoOL PEriod
21 Band oddly drops italics TLC _T_L_C_
23 Fixes resort before days without prosecutor SPAYS SPA+(-da)YS
25 Surprised word concerning Czech river OHRE OH+RE
26 Media magnate breaking hearts HEARST HEARTS*
27 Rating according to Romeo or Juliet ELOPER ELO+PER
30 Confused gran called RANG GRAN*
33 Sarin diffuses to part of the nose NARIS SARIN*
34 Partially imitate a bird EMU EMU(late)
35 Typical guy NORM ddef.
36 Masses concealing an African fox ASSE mASSEs
37 Too many try to become a Princess Bride character MONTOYA TOOMANY*
40 Bishop ignores nonsense at a breakfast joint IHOP (-b)I(-s)HOP
41 Reference worn down before... ERE refEREnce
42 ...German girl terraforms isle ILSE ISLE*
43 Rob old Turkish governor occupied with street DELANEY DE(LANE)Y
44 Struck by reported requirement KNEED "need" homophone
45 Base lair on paradise EDEN E+DEN
46 City erupts from Ed's knot DONETSK ED'S KNOT*

Down Clue Answer Explanation
1 Seth Rogen abandons hotel, reinvests in a steroid ESTROGEN SET(-h)ROGEN*
3 Figures of speech coming from other's map METAPHORS OTHER'S MAP*
4 Wander aimlessly, drop final bend, get more average? MEANER MEAN(-d)ER
5 Programmed topless and consumed way too much ODED (-c)ODED
6 A Roman and a nereid IONE I+ONE
7 Dry endlessly blended dairy ARID DAIR(-y)*
8 Demon in the style of an antelope IMPALA IMP+A LA
9 Perpetually converting loss to win helps ALWAYS AL(l->W)AYS
10 Odd drainage permits rats! DANG D_A_N_G_
12 Zappa blockades, imprisons artist PABLO zapPA BLOckades
13 Screw ChatGPT and attract catastrophe FAILURE F+AI+LURE
19 Stone creatures fabricate or lay eggs GARGOYLES OR LAY EGGS*
21 Places shirts TEES ddef.
22 Relish swapping that guy for a house where Santa breaks in CHIMNEY C(hut->HIM)NEY
23 Country exchanges rupees after taking a bit off PERU RUPE(-es)*
24 Impressed by conclusion of gnome onslaught STAMPEDE STAMPED+_E
28 Mostly happy with sublet LEASED (-p)LEASED
29 Durian pasta, shrimp etoufee, teriyaki carp ends up in dish (2 words) PIEPAN reverse last letters
31 Oil up strange nation ANOINT NATION*
32 Rub out right in the middle of resting ERASE E(R)ASE
36 Essential claims of French help AIDE (cl)AI(ms)+DE
37 Morning space agreement AMEN AM+EN
38 Core OS stores a cookie OREO cORE Os
39 Share Sulu's actor without me TAKE TAKE(-i)

Once completed, six words in the grid should stick out as not quite matching what was clued.

Clue Clued Word Word in Grid
11 Across SEWED SPEED
17 Across BRANDED BANDIED
23 Across SPAYS PLAYS
30 Across RANG RAGE
28 Down LEASED LASHED
37 Down AMEN MEND

For each of these words, one letter has been dropped out (fell down a chute) and another has been inserted (adder-ed). Solvers should hopefully notice that the chute letters can be organized to spell out ANSWER. Sorting by this and looking at the added letters gives the answer, DELPHI.

Clued Word Word in Grid Chute Adder
AMEN MEND A D
RANG RAGE N E
SPAYS PLAYS S L
SEWED SPEED W P
LEASED LASHED E H
BRANDED BANDIED R I