Some fantastic wine (4)
I believe the answer is:
asti
'wine' is the definition.
(Italian wine)
'some fantastic' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'ASTI' is hidden in the letters of 'fantastic'.
(Other definitions for asti that I've seen before include "White wine named after a town in Piedmont" , "- spumante, It. wine" , "Italian wine - (then change a letter for ...)" , "Italian town producing sparkling wine" , "It's a (anag) - wine" .)