Topic in church that’s more appropriate? (7)
I believe the answer is:
chapter
'topic' is the definition.
(thesaurus)
'church that's more appropriate?' is the wordplay.
'church' becomes 'ch' (common abbreviation).
'that's more appropriate?' becomes 'apter' ('apt' can be a synonym of 'appropriate').
'ch'+'apter'='CHAPTER'
'in' is the link.
(Other definitions for chapter that I've seen before include "Ecclesiastical assembly or subdivision of a written work" , "series of events" , "Sequence - section of book - church body" , "Division of novel - church body" , "reading- matter" .)