Rob of a coat (6)
I believe the answer is:
fleece
This clue is a double definition.
'rob' is the first definition.
(synonyms)
'a coat' is the second definition.
(fleece is a kind of coat)
'of' acts as a link.
(Other definitions for fleece that I've seen before include "Overcharge" , "Outer coat of sheep" , "Rip off" , "Do some asset stripping" , "Charge way over the odds" .)