On return, Rose Brown got through to the politician (7)
I believe the answer is:
senator
'to the politician' is the definition.
(senator is a kind of politician)
'on return rose brown got' is the wordplay.
I cannot quite understand how this works, but
'on' could be 'at' (I've seen this in other clues) and 'at' is located in the answer.
The remaining letters 'senor' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
'through' is the link.
Can you help me to learn more?
(Other definitions for senator that I've seen before include "eg Bob Dole" , "Member of upper house of legislature" , "US legislator" , "Roman legislator" , "Legislator -- treason (anag)" .)