Fashionable fur coats primarily attract the insanely greedy (10)
I believe the answer is:
insatiable
'greedy' is the definition.
(thesaurus)
'fashionable fur coats' is the wordplay.
'fashionable' becomes 'in' ('in' can be similar in meaning to 'fashionable').
'fur coats' becomes 'satiable' (I can't explain this - if you can you should give a lot more credence to this answer).
'in'+'satiable'='INSATIABLE'
'primarily attract the insanely' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for insatiable that I've seen before include "Never satisfied" , "Having desires impossible to satisfy" , "can't get enough of it" , "Avid" , "Unquenchable" .)