Politician taking money to fiddle a rota (7)
I believe the answer is:
senator
'politician' is the definition.
(senator is a kind of politician)
'taking money to fiddle a rota' is the wordplay.
'taking' means one lot of letters goes inside another.
'money' becomes 'sen' (I've seen this before).
'to fiddle' is an anagram indicator.
'rota' with letters rearranged gives 'ator'.
'sen' going within 'ator' is 'SENATOR'.
(Other definitions for senator that I've seen before include "American politician" , "Member of government" , "US legislator" , "eg Bob Dole" , "One from uni's governing body" .)