Opposed to work's quality rating (4)

I believe the answer is:

vsop

'quality rating' is the definition.
(Very Superior Old Pale, quality rating for brandy)

'opposed to work's' is the wordplay.
'opposed to' becomes 'vs' (versus).
'work' becomes 'op' (abbreviation for opus).
'vs'+'op'='VSOP'

I've seen this clue in The Guardian.

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