California brought in French and Italian wine — an Italian white (8)
I believe the answer is:
frascati
'an italian white' is the definition.
(Italian white wine)
'california brought in french and italian wine' is the wordplay.
'california' becomes 'CA' (abbreviation).
'brought in' means one lot of letters goes inside another.
'french' becomes 'fr' (abbreviation).
'and' says to put letters next to each other.
'italian wine' becomes 'asti' (I've seen this in another clue).
'fr'+'asti'='frasti'
'ca' placed inside 'frasti' is 'FRASCATI'.
(Other definitions for frascati that I've seen before include "White Italian wine" , "Italian city" , "It. town and wine" .)