Soft fluffy wool (6)
I believe the answer is:
angora
'soft fluffy wool' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for angora that I've seen before include "Goat producing mohair" , "Long-haired cat, goat, or rabbit" , "Yarn made from hair of goats or rabbits" , "Name of goat at 12 Across" , "Yarn or fabric made from goat hair" .)