Rewarded for material assistance? (6)
I believe the answer is:
repaid
'rewarded' is the definition.
('repay' can be a synonym of 'reward')
'material assistance?' is the wordplay.
'material' becomes 'rep' (rep is a kind of material).
'assistance?' becomes 'aid' ('aid' can be a synonym of 'assistance').
'rep'+'aid'='REPAID'
'for' is the link.
(Other definitions for repaid that I've seen before include "Recompensed" , "Reimbursed" , "Gave back money owed" , "Returned" , "Refunded or rewarded" .)