Crossword Genius

Voltaire exuding anger could become a sort of green (5)

Ross

I believe the answer is:

lovat

'a sort of green' is the definition.
(lovat is a shade of green)

I can't explain the remainder of the clue.

(Other definitions for lovat that I've seen before include "(Of woollen cloth) muted green-blue colour" , "Green used in tweeds, etc" , "sort of green" , "Green colour, as of tweed" , "Green cloth" .)

I've seen this clue in The Guardian.
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