Wine from Castile (4)

I believe the answer is:
asti
'wine' is the definition.
(I've seen this before)
'from castile' is the wordplay.
'from' indicates the answer is hidden within the clue.
'ASTI' can be found hidden inside 'castile'.
(Other definitions for asti that I've seen before include "Alcohol" , "town in Italy" , "Piedmont wine city, SE of Turin" , "- spumante, It. wine" , "It's a (anag) - wine" .)