Tartness (8)

I believe the answer is:

acerbity

'tartness' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for acerbity that I've seen before include "Harshness or sharpness of speech" , "Sharp and forthright manner" , "Sharpness, forthrightness" , "Sharp/forthright manner" , "roughness" .)

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

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