Unusual Argentine fruit (9)
I believe the answer is:
tangerine
'fruit' is the definition.
(tangerine is a kind of fruit)
'unusual argentine' is the wordplay.
'unusual' indicates an anagram.
'argentine' is an anagram of 'TANGERINE'.
(Other definitions for tangerine that I've seen before include "Taste" , "orange colour" , "Small orange" , "Tree" , "Small citrus fruit with a loose skin" .)