Pay back (6)
'pay back' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for reimburse that I've seen before include "Repay - reuse brim" , "refund" , "Pay back any expenses incurred" , "Repay (a sum of money)" , "Compensate for money already spent" .)
'pay back' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for refund that I've seen before include "Give back" , "Money returned" , "money to be paid back" , "Cash back" .)