Steal fastener at church (5)
I believe the answer is:
pinch
'steal' is the definition.
(pinch can mean to steal)
'fastener at church' is the wordplay.
'fastener' becomes 'pin' (pin is a kind of fastener).
'at' means one lot of letters go next to another.
'church' becomes 'ch' (abbreviation on maps etc).
'pin'+'ch'='PINCH'
(Other definitions for pinch that I've seen before include "appropriate" , "Steal - a little salt, for example" , "Tweak" , "Pilfer" , "Economise - steal" .)