Resentful, quiet, Warhol's concocted thing involving pop? (6,6)

I believe the answer is:

bitter shandy

'concocted thing involving pop?' is the definition.
(lemonade and beer mixture)

'resentful quiet warhol's' is the wordplay.
'resentful' becomes 'bitter' (synonyms).
'quiet' becomes 'sh' (both can be said to tell someone to be quiet).
'warhol' becomes 'Andy' (Andy Warhol).
'bitter'+'sh'+'andy'='BITTER SHANDY'

I've seen this clue in The Everyman puzzle in The Observer.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.