Collect for a service (5)
I believe the answer is:
amass
'collect' is the definition.
(I know that collect can be written as amass)
'a service' is the wordplay.
'service' becomes 'mass' (kind of church service).
'a'+'mass'='AMASS'
'for' acts as a link.
(Other definitions for amass that I've seen before include "Gathers" , "Sodium chloride" , "Accumulate, pile up" , "Gather together, pile up" , "store" .)