Fine sheep’s wool (6)
I believe the answer is:
merino
'fine sheep's wool' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for merino that I've seen before include "Type of sheep" , "Long-haired sheep" , "Fine soft woolen yarn" , "Sheep with fine quality fleece" , "Sheep from Spain with a heavy quality fleece" .)