Finally serve ace, then service finding net (4)
I believe the answer is:
earn
'net' is the definition.
(I know that net is a more specific form of the action bear)
'finally serve ace then service' is the wordplay.
'finally' says to take the final letters.
'ace' becomes 'a' (abbreviation).
'then' means one lot of letters go next to another.
'service' becomes 'RN' (abbreviation for Royal Navy).
The last letter of 'serve' is 'e'.
'e'+'a'+'rn'='EARN'
'finding' acts as a link.
(Other definitions for earn that I've seen before include "Obtain (money) in return for labour or services" , "Deserve, gain" , "Gain by working" , "Gain through labour or work" , "Acquire by one's efforts" .)