In sweet wine, it's double (4)

I believe the answer is:

twin

'double' is the definition.
(twin can mean someone's double)

'in sweet wine it's' is the wordplay.
'in' indicates the answer is hidden within the clue.
'TWIN' is hidden in the letters of 'sweet wine ts'.

(Other definitions for twin that I've seen before include "One of an identical pair" , "Castor or Pollux?" , "Balearic island" , "Identical sibling" , "indistinguishable from the next?" .)

I've seen this clue in the Evening Standard.

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