What's wrong in a current clergyman? (10)
I believe the answer is:
inaccurate
'what's wrong' is the definition.
(similar in meaning)
'in a current clergyman?' is the wordplay.
'a current' becomes 'ac' (alternating current).
'clergyman?' becomes 'curate' (curate is a kind of clergyman).
'in'+'ac'+'curate'='INACCURATE'
(Other definitions for inaccurate that I've seen before include "not hitting all the right notes?" , "Unreliable" , "wrong" .)