A feature of church keeping Father upset (7)
I believe the answer is:
affront
'upset' is the definition.
'a feature of church keeping father' is the wordplay.
'feature of church' becomes 'font' (type of church receptacle).
'keeping' is an insertion indicator.
'father' becomes 'fr'.
'font' enclosing 'fr' is 'ffront'.
'a'+'ffront'='AFFRONT'
(Other definitions for affront that I've seen before include "Deliberate insult or show of disrespect" , "Rant off over insult" , "Snub" , "Action causing outrage or offence" , "Insult to one's face" .)