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Sharp (5)

Ross

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4 5 6

7

'sharp' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for acerbic that I've seen before include "tart" , "Tasting bitter; forthright" , "Tasting sour or caustic in speech" , "Sarcastic" , "Astringent; sour" .)

I've seen this clue in The Mirror and the Sydney Morning Herald.
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