Get paid for each service (4)
I believe the answer is:
earn
'get paid' is the definition.
(I've seen this before)
'each service' is the wordplay.
'each' becomes 'ea'.
'service' becomes 'rn' (abbreviation for Royal Navy).
'ea'+'rn'='EARN'
'for' is the link.
(Other definitions for earn that I've seen before include "Make - merit" , "Merit through work or effort" , "Get (money) for work or labour" , "Merit (a reward)" , "Receive in return for" .)