Dispatched men to obtain answer for politician (7)
I believe the answer is:
senator
'for politician' is the definition.
(senator is a kind of politician)
'dispatched men to obtain answer' is the wordplay.
'dispatched' becomes 'sent' (I've seen this before).
'men' becomes 'OR' (military abbreviation for Other Ranks).
'to obtain' is an insertion indicator.
'answer' becomes 'a' (abbreviation eg in Q and A).
'sent'+'or'='sentor'
'sentor' enclosing 'a' is 'SENATOR'.
(Other definitions for senator that I've seen before include "eg Bob Dole" , "Treason committed by member of Upper House" , "US politician" , "Member of Upper House engaged in treason" , "Roman politician" .)