Piquancy (4)

I think it could be either:

tang

zest

'piquancy' is the definition.
(I know that piquancy can be written as tang)

This is the entire clue.

(Other definitions for tang that I've seen before include "Dynasty's" , "Aroma" , "The biting flavour of seaweed" , "Strong flavour/smell" , "Pungency" .)

I've seen this clue in The New York Times, the Evening Standard, the Sydney Morning Herald, the Universal, The Independent, the Newsday, The Mirror and the LA Times.

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