Woman partial to Chardonnay (5)
I believe the answer is:
donna
'woman' is the definition.
(donna is a kind of woman)
'partial to chardonnay' is the wordplay.
'partial to' indicates a hidden word (the answer forms part of the clue).
'DONNA' can be found hidden inside 'chardonnay'.
(Other definitions for donna that I've seen before include "Italian woman of rank" , "Title of Spanish or Portuguese lady" , "Title of Spanish or Italian lady" , "Female" , "Spanish lady's title" .)