Tart church man (5)
I believe the answer is:
piece
'man' is the definition.
(synonyms)
'tart church' is the wordplay.
'tart' becomes 'pie' (both are baked goods).
'church' becomes 'CE' (abbreviation for Church of England).
'pie'+'ce'='PIECE'
(Other definitions for piece that I've seen before include "man on board" , "Separate part of a whole" , "Bit - part" , "American gun" , "Morsel" .)