Rebuke for being concealed in church (5)
I believe the answer is:
chide
'rebuke' is the definition.
('chide' can be a synonym of 'rebuke')
'concealed in church' is the wordplay.
'concealed' becomes 'hid' ('hide' can be a synonym of 'conceal').
'in' is an insertion indicator.
'church' becomes 'ce' (abbreviation for Church of England).
'hid' placed into 'ce' is 'CHIDE'.
'for being' is the link.
(Other definitions for chide that I've seen before include "Santa's laugh" , "Censure angrily" , "Seeing scold" , "Tear off strip" , "Censure, berate" .)