Wealthy campaign donor (3,3)
I believe the answer is:
fat cat
'wealthy campaign donor' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for fat cat that I've seen before include "Wealthy person like obese feline" , "pampered pet" , "Derogatory term for wealthy person" , "Influential politician" , "Banking executive maybe" .)