Weaken female leaving to provide finance for fur (9)
I believe the answer is:
undermine
'weaken female' is the definition.
'undermine' can be an answer for 'weaken' (synonyms). I am unsure of the 'female' bit.
'to provide finance for fur' is the wordplay.
'to provide finance for' becomes 'und' (I can't justify this - if you can you should give a lot more credence to this answer).
'fur' becomes 'ermine' (ermine is a kind of fur).
'und'+'ermine'='UNDERMINE'
'leaving' acts as a link.
Can you help me to learn more?
(Other definitions for undermine that I've seen before include "Burrow below" , "Sabotage; subvert" , "Subvert or weaken gradually" , "Erode the base or foundation of" , "Weaken, sap" .)