Choose diamonds and French fur (9)
I believe the answer is:
determine
'choose' is the definition.
(I know that determine is a kind of choose)
'diamonds and french fur' is the wordplay.
'diamonds' becomes 'd' (abbreviation in bridge say).
'and french' becomes 'et' ('and' in French).
'fur' becomes 'ermine' (ermine is a kind of fur).
'd'+'et'+'ermine'='DETERMINE'
(Other definitions for determine that I've seen before include "Learn" , "Dictate" , "I'm entered, so find our precisely" , "Ascertain by research or calculation" , "fix" .)