Account by clergyman is perfectly correct (8)
I believe the answer is:
accurate
'perfectly correct' is the definition.
'accurate' can be an answer for 'correct' (similar in meaning). I am not certain of the 'perfectly' bit.
'account by clergyman' is the wordplay.
'account' becomes 'ac' (abbreviation for account).
'by' says to put letters next to each other.
'clergyman' becomes 'curate' (curate is a kind of clergyman).
'ac'+'curate'='ACCURATE'
'is' acts as a link.
Can you help me to learn more?
(Other definitions for accurate that I've seen before include "faithful" , "Spot on" , "Care a cut is exact" , "telling it like it is" , "Absolutely correct" .)