Compensated a representative with assistance (6)
I believe the answer is:
repaid
'compensated' is the definition.
(I've seen this before)
'a representative with assistance' is the wordplay.
'a representative' becomes 'rep' (rep is a kind of representative).
'with' means one lot of letters go next to another.
'assistance' becomes 'aid' (synonyms).
'rep'+'aid'='REPAID'
(Other definitions for repaid that I've seen before include "Diaper (anag.)" , "Recompensed" , "Compensated" , "Reimbursed" , "Refunded or rewarded" .)