Crossword Genius

Catty drinkers knocked back Bud with a soprano (7)

Ross

I believe the answer is:

lappers

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'catty drinkers knocked' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'back bud with a soprano' is the wordplay.
'back' shows that the letters should be reversed in order.
'bud' becomes 'pal' (I've seen this before).
'with' is a charade indicator (letters next to each other).
'a' becomes 'per' (eg 'one a day' means 'one per day').
'soprano' becomes 's' (musical abbreviation).
'pal' in reverse letter order is 'lap'.
'lap'+'per'+'s'='LAPPERS'

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I've seen this clue in The Independent.
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