Crossword Genius

Retsina being drunk is more unpleasant (7)

Ross

I believe the answer is:

nastier

'more unpleasant' is the definition.
('nasty' can be a synonym of 'unpleasant')

'retsina being drunk' is the wordplay.
'being drunk' is an anagram indicator.
'retsina' is an anagram of 'NASTIER'.

'is' acts as a link.

(Other definitions for nastier that I've seen before include "becomes more unpleasant" , "More unpleasant or distasteful" , "More horrid" , "more awkward" , "More damaging" .)

I've seen this clue in The Telegraph.
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