Woolly breed of cattle (6)
I believe the answer is:
jersey
This clue is a triple definition!
'woolly' is the first definition.
(I've seen this before)
'breed' is the second definition.
(I have seen 'Breed of cow ' mean 'jersey' so perhaps 'breed' could also mean 'jersey')
'of' acts as a link.
'cattle' is the third definition.
(Jersey is an example)
(Other definitions for jersey that I've seen before include "Largest of the Channel Islands" , "One over the moon might have been such" , "Milked" , "Woolly" , "Supplier of dairy produce" .)