Hound keeps inside church (5)
I believe the answer is:
chase
'hound' is the definition.
(I've seen this before)
'keeps inside church' is the wordplay.
'keeps' becomes 'has' (keep can mean to have or possess).
'inside' is an insertion indicator.
'church' becomes 'ce' (abbreviation for Church of England).
'has' inserted into 'ce' is 'CHASE'.
(Other definitions for chase that I've seen before include "Hurry" , "Follow" , "Hound" , "Pursue; decorate (metal) by engraving" , "Engrave - hunt - pursue" .)