Rich type who drinks a lot (4)
I believe the answer is:
lush
This clue is a double definition.
'rich' is the first definition.
(similar in meaning)
'type who drinks a lot' is the second definition.
(term for an alcoholic)
(Other definitions for lush that I've seen before include "Growing thickly; drunkard" , "one wants a lot to drink" , "Lavish - boozer" , "one mortal too often" , "sponge" .)