Not exactly thematic but

by Martyn Crosby

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A.   Chin rot destroyed Greek city (7)

B.   I`m pilot`s hero, acrobatically moving towards the
sun (12)

C.   Butts neck feather poorly constructed (10)

D.   Must his change strip like location of A? (7)

E.   Guide towards the bottom conclusion of confrontation
(8)

F.   "Do but _ confound, His strength the more is" (
Bunyan, Pilgrim`s Progress- adapted in the English Hymnal) (10)

G.   Hop up, remove nothing from IOU before such changes
between Hercules and Scorpius (9)

H.   Alas, elephant upset Greek goddess (6,6)

I.   Shake the pollens for site of Hero`s exploits (10)

J.   Relief in appeasement (4)

K.   Ill-considered skin condition (4)

L.   Confused, weakminded, DNA extracted on Wednesday (7)

M.   Arriverderci, Tedesco! Au revoir, Allemand! (3, 11)

N.   Bar bet about joint feature (6)

O.   Tearful Homer`s clay transformed (10)

P.   Of x 10, frequently (10)

Q.   Siting tent, we convert Austrian philosopher (12)

R.   "I am dead, dead, but in the _ _ " (Life of Benjamin
Disraeli) (7,6)

S.   Affirm demon conversion of temporary psychological
state (5,2,4)

T.   Bloodbath let enquiry hide sporting competitor (7)

U.   Converting, illume hut at the ends of the earth (6,5)

V.   Her wishes, reconstructed without the logarithmic
base, are bad-tempered (8)

W.   I to college, confused, let purpose become evident
in natural phenomena! (10)

X.   Irreligious lowland hue repainted (10)

Y.   Latvian`s kiss upsets revolutionary theatre director
(12)