Instigate one new church feature (7)
I believe the answer is:
inspire
'instigate' is the definition.
('inspire' can be a synonym of 'instigate')
'one new church feature' is the wordplay.
'one new' becomes 'in' (I've seen this in other clues).
'church feature' becomes 'spire' (I've seen this before).
'in'+'spire'='INSPIRE'
(Other definitions for inspire that I've seen before include "Fill with confidence - be the origin of" , "Encourage - breathe in" , "Arouse, prompt (to new heights)" , "Motivate" , "Fill with creative purpose" .)