Fat from wool (7)
I believe the answer is:
lanolin
'fat from wool' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for lanolin that I've seen before include "Fatty substance on wool" , "Fat extracted from wool" , "Fatty coating on wool" , "Oil extracted from wool" , "Yellow viscous oil from animals -- in on all (anag)" .)