Sparkling drink, some signorina's tipple (4)
I believe the answer is:
asti
'sparkling drink' is the definition.
(I've seen this before)
'some signorina's tipple' 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 'signorinas tipple'.
(Other definitions for asti that I've seen before include "Italian 'sparkler'" , "18" , "Sparkling drink" , "White wine named after a town in Piedmont" , "Italian drunk" .)