Hypocritical trendy church about to admit offence (9)
I believe the answer is:
insincere
'hypocritical' is the definition.
('insincere' can be a synonym of 'hypocritical')
'trendy church about to admit offence' is the wordplay.
'trendy' becomes 'in'.
'church' becomes 'ce' (abbreviation for Church of England).
'about' becomes 're' (regarding**).
'to admit' means one lot of letters goes inside another.
'offence' becomes 'sin' (I've seen this before).
'in'+'ce'+'re'='incere'
'incere' placed around 'sin' is 'INSINCERE'.
(Other definitions for insincere that I've seen before include "Not expressing genuine feelings" , "Deceitful, not genuine" , "Not genuine, feigned" , "may be laying it on" , "tricky" .)