At one time eating hot food mainly in church event (10)
I believe the answer is:
occurrence
'event' is the definition.
(occurrence is a kind of event)
'at one time eating hot food mainly in church' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'o' (I've seen this in other clues) and 'o' is located in the answer.
'food' could be 'e' (E is an example) and 'e' is present in the answer.
'church' could be 'ce' (abbreviation for Church of England) and 'ce' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
(Other definitions for occurrence that I've seen before include "Event" , "Happening" .)