Rip off wool (6)
I believe the answer is:
fleece
I believe this is a double definition.
'rip off' is the first definition.
(fleecing is a kind of ripping off)
'wool' is the second definition.
(fleece is a kind of wool)
(Other definitions for fleece that I've seen before include "Charge too much" , "Swindle - wool removed from sheep" , "9ac's coat" , "Plunder; charge (someone) exorbitantly" , "Swindle; sheep's coat" .)