Wealthy industrialist (3,3)
I believe the answer is:
fat cat
'wealthy industrialist' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for fat cat that I've seen before include "pampered pet" , "Someone (undeservedly?) rich in business" , "Rich man" , "Wealthy and privileged person" , "Wealthy and powerful person (informal)" .)