Song in church that man heard (4)
I believe the answer is:
hymn
'song in church' is the definition.
(I've seen this before)
'man heard' is the wordplay.
'man' becomes 'him'.
'heard' indicates a 'sounds like' (homophone) clue.
'him' sounds like 'HYMN'.
'that' acts as a link.
(Other definitions for hymn that I've seen before include "religious works" , "Song of worship" , "religious composition" , "Carol perhaps" , "Song of praise to God" .)