Crossword Genius

Wine region hidden in "Castile" (4)

Ross

I believe the answer is:

asti

(Other definitions for asti that I've seen before include "Italian wine - (then change a letter for ...)" , "Italian drunk" , "town in Italy" , "Piedmontese white wine" , "Sparkling white wine" .)

I've seen this clue in the Universal.
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