Crossword Genius

Solvent of very good quality (7)

Ross

I believe the answer is:

acetone

'solvent' is the definition.
(acetone is a kind of solvent)

'very good quality' is the wordplay.
'very good' becomes 'ace' (I've seen this before).
'quality' becomes 'tone' (synonyms).
'ace'+'tone'='ACETONE'

'of' is the link.

(Other definitions for acetone that I've seen before include "it dissolves" , "Paint thinner" , "Volatile stuff" , "chemical is the solution" , "Industrial solvent" .)

I've seen this clue in the Evening Standard.
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