Moderate politician (8)
I believe the answer is:
centrist
'moderate politician' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for centrist that I've seen before include "Person who takes a middle-of-the-road political position" , "A middle-of-the-road person in politics" , "One taking the middle ground" , "Moderate politician" , "Politician who takes middle-of-the-road position" .)