Inform church after meal (5)
I believe the answer is:
teach
'inform' is the definition.
(teaching is a kind of informing)
'church after meal' is the wordplay.
'church' becomes 'ch' (common abbreviation).
'after' is a charade indicator (letters next to each other).
'meal' becomes 'tea' (tea is a kind of meal).
'ch' put after 'tea' is 'TEACH'.
(Other definitions for teach that I've seen before include "Instruct, enlighten" , "train" , "Pass on knowledge" , "Tutor" , "show" .)