High churchman on time? (7)
I believe the answer is:
prelate
'high churchman' is the definition.
'on time?' is the wordplay.
I cannot quite understand how this works, but
'on' could be 're' ('on' can be mean 'with reference to') and 're' is located in the answer.
'time?' could be 't' and 't' is found in the answer.
This may be the basis of clue (or it may be nonsense).
(Other definitions for prelate that I've seen before include "Senior member of the clergy" , "High-ranking member of clergy, say bishop" , "Senior churchman" , "High church dignitary" , "Church high-ranker" .)