Darn! solution
by Kegler

As indicated by 21 Across, DOGGONE, five answers lose a synonym for DOG before entry.

Darn! solution grid

Across
1HEADWAITERS ("WED HATERS" spoonerism)
9MUTTONCHOPS (THOMPSON CUT anag)
11A(PE)X
12C,(OK)E
15penELOPE
16P + UP + PET(E)ER
17DARE (READ anag)
19VI + TALLY
21DOGGONE
23OUSTERS (SOUREST anag)
25GO + D + S
26PAT + IN + A
28C(UT)IT
30MIR + O (rev)
31FIRSt
32E(PAUL)ET (TEE rev)
33CAMERA OBSCURAS (CAME ACROSS A BUR anag)
Down
1HOREHOUND DROPS (DONOR HOPED RUSH anag)
2ENOL (rev)
3A + C + CORDS
4WOK + E
5IS + LET
6TAR + TAN
7EPEE (hidden)
8[R/l]EVELED
10HOP + E
13E(PI)GRAM (MARGE rev)
14CRYOSTATS (CAST STORY anag)
18A(QU) + ARIA
20cLEO + TOLd + STOrY
22OTIOSE (rev hidden)
24cENTER
25GUR + U (rev)
27ThE + RM
28CIA + O
29IDEA (AIDE anag)