Cholesterol-lowering drug (6)
I believe the answer is:
statin
'cholesterol-lowering drug' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for statin that I've seen before include "Cholesterol-lowering drug" , "Cholesterol-reducing drug" , "Drug given to reduce blood cholesterol" , "Drug reducing cholesterol" .)