Regain or make good (6)
I believe the answer is:
recoup
This clue is a double definition.
'regain' is the first definition.
(I've seen this before)
'make good' is the second definition.
(synonyms)
(Other definitions for recoup that I've seen before include "Get back again, say losses (6)" , "Get back or recover - say losses" , "Make good a loss" , "Reimburse or compensate" , "Get back, say expenses" .)