Agree that man must enter church (5)
I believe the answer is:
chime
'agree' is the definition.
(thesaurus)
'man must enter church' is the wordplay.
'man' becomes 'him' ().
'must enter' means one lot of letters goes inside another.
'church' becomes 'CE' (abbreviation for Church of England).
'him' going into 'ce' is 'CHIME'.
'that' is the link.
(Other definitions for chime that I've seen before include "Clang" , "(Of bells) ring" , "Agree (with); ring" , "Sound of bell - agree" , "Harmonise, peal" .)