Assemble a church service (5)

I believe the answer is:

amass

'assemble' is the definition.
(I've seen this in another clue)

'a church service' is the wordplay.
'church service' becomes 'mass' (Mass is a type of church service).
'a'+'mass'='AMASS'

(Other definitions for amass that I've seen before include "store" , "Put together" , "Gather in great quantity" , "Collect, hoard" , "Gather together, pile up" .)

I've seen this clue in The Times.

Want a hint initially instead of a full solution? Install my app