Mea culpa

by Martyn Crosby

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A.   Old wish safe-conduct transformed to calculate current
value of a future payoff (10,4,4)

B.   How heathen climatologist tows out aphorism exhorting
patience (3,6,4,2,5,3,4)

C.   Unsolicited failure of Navy truck, on abruptly exploding
(9,10)

D.   Centrally located, it held denim up (2,3,6)

E.   Reformed comedian is king, reaching a conclusion
(8-6)

F.   Hiding, she mends upset nobility (14)

G.   Natural ability left as source of income (9)

H.   Caught in the act, ended hard-up (3-6)

I.   Conceited hide badge away (9)

J.   Sidelined, Ann Ross dropped goodnaturedness, confused
(5,3)

K.   German President, a man given to paying overbearing
sexual attention to women, finishes aria and produces snakewood (9)

L.   Swollen costume ends, if reversed, with shortened
edition (8)

M.   We fluff at overturning German air power (9)

N.   Crazily, I`ve a taste to sleep through summer (9)

O.   Conceal failures in lime and water (9)

P.   Look again when French Queen gets around short test
(9)

Q.   I concealed pay, disguised comprehensive reference
work (13)

R.   One vanished over quality of teflon (11)

S.   Worthless trinket produced when dance takes on King
briefly at chess (7)

T.   Study of native rhythms upset Guy Michelson, too (15)

U.   Partisan acknowledges concealing Yemeni capital (4)

V.   Enigma we churned over for improved public persona
(3,5)

W.   " _ _ _ _ _ _ _ , a fellow of infinite jest, of
most excellent fancy" (4,4,6,1,4,3,7) (Hamlet)

X.   Arthur`s circle (7,2,3,5,5)

Y.   Awkwardly, no mess-up exonerates unpremeditated
status (18)