Screw: one's sheared off (6)
I believe the answer is:
fleece
I believe this clue is a double definition.
'screw' is the first definition.
(thesaurus)
'one's sheared off' is the second definition.
(Other definitions for fleece that I've seen before include "Swindle; sheep's coat" , "Plunder; charge (someone) exorbitantly" , "Sheep's woollen coat" , "Charge too much" , "Woolly hair of sheep" .)