Church with fashionable feature (4)
I believe the answer is:
chin
'feature' is the definition.
(chin is a kind of feature)
'church with fashionable' is the wordplay.
'church' becomes 'ch' (common abbreviation).
'with' means one lot of letters go next to another.
'fashionable' becomes 'in' ('in' can be similar in meaning to 'fashionable').
'ch'+'in'='CHIN'
(Other definitions for chin that I've seen before include "Punch to the face" , "Bottom part of jaw" , "Keep it up and be optimistic" , "Facial feature" , "'... up, stay cheerful (4)'" .)