Remunerate ace postmen perhaps (10)
I believe the answer is:
compensate
'remunerate' is the definition.
(synonyms)
'ace postmen perhaps' is the wordplay.
'perhaps' is an anagram indicator.
'ace'+'postmen'='acepostmen'
'acepostmen' with letters rearranged gives 'COMPENSATE'.
(Other definitions for compensate that I've seen before include "Make good" , "Reimburse" , "Balance" , "Make financial amends to" , "attempt to limit damage" .)