Account by clergyman is error-free (8)
I believe the answer is:
accurate
'error-free' is the definition.
I can't judge whether this defines the answer.
'account by clergyman' is the wordplay.
'account' becomes 'ac' (abbreviation for account).
'by' means one lot of letters go next to another.
'clergyman' becomes 'curate' (assistant to a priest).
'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 "Factual" , "telling it like it is" , "Bang on" , "Precise and exact (8)" , "Correct, right" .)