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Sullen (4)

Ross

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4

5 6 8

'sullen' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for sour that I've seen before include "Acid tasting" , "Bitter, tart" , "Vinegary" , "Embittered" , "Acid - rancid" .)

I've seen this clue in the Sydney Morning Herald, The Mirror, the Evening Standard, The Star Tribune, the Penny Press, The Independent, The Sunday Times, the LA Times, The Sun, The New York Times, the Universal and The Times.
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