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ACROSS
 1 Abusive language in Montana scandal? (12)
 8 Ridiculous, absurd, lacking one bit of intelligence! (9)
 9 Doctor’s dog at doctor’s workplace (5)
11 Schemer gestures, exhibiting surfaces (7)
12 When you speak, dropping a vowel sound is heavenly (7)
13 Damage demonic appearance? (6)
15 Paid to release South African money, with a portion invested (8)
18 Present exotic tea bowls (8)
19 For example, masculine king from the East! (6)
21 Aiming to get rid of $1000 drug (7)
23 Jar sound equipment at dance (7)
25 500 or 1000 residents, ultimately, in student housing (5)
26 Finally, Martha Washington covered by above-average celebrity tribute on television (9)
27 Hypercritical types—seismologists, perhaps? (12)
DOWN
 1 Notice location of ammunition towards the center of a boat (8,5)
 2 For instance, plaything almost put up in house (5)
 3 In part of machine, a bug: wheel is not readily identifiable (9)
 4 Shrinkage seen between the edges of grimy photo (6)
 5 “It makes the car go,” Unser said with difficulty (3,5)
 6 Sticky and sharp? (5)
 7 What slow cowboys do in early Westerns: snack (5,3)
10 Mathematician-philosopher misplaced decent erasers (4,9)
14 Fathers display travel document (8)
16 Very softly, editor interrupted Gertrude and intervened (7,2)
17 Anthropophagus is able to point a laser at first (8)
20 Replay of fastball reveals reduction in force (6)
22 Jamaican, possibly, exalting a once-powerful Russian (5)
24 Love wise Native American (5)
 
ACROSS 1 hidden 4 A(VAIL)ABLE
9 anag. 10 WOR(R + I.E.)D 11 anag. 12 L + OUD 15 phonetic hidden
16 PATH + ETIC (cite rev.) 18 [p]RESIDENT 20 TRA + DER (rev.)
23 YAM + S (rev.) 24 pun 26 [m]OBS + CURE 27 CHI + ANTI 28 2 defs.
29 hidden

DOWN 1 PEPPERS + P + RAY 2 LEA + FIER (fire anag.) 3 anag. 4 AF + RAID 5 A + SWELL + A’S 6 2 defs.
7 B(AIL)OUT 13 anag. 14 P(HARM)ACIES (I space anag.) 17 2 defs.
19 SIM(P.S.)ON 21 DE[s]IGNED
22 CIRC + US (cric[k] rev.) 25 pun
26 & 8 opposites