Service from mother ship (4)
I believe the answer is:
mass
'service' is the definition.
(mass is a church service)
'mother ship' is the wordplay.
'mother' becomes 'ma' (ma can mean mother).
'ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'ma'+'ss'='MASS'
'from' acts as a link.
(Other definitions for mass that I've seen before include "Religious rite" , "Church service - crowd" , "congregation for > service" , "Widespread" , "Holy service" .)