Biting (7)

I believe the answer is:

mordant

'biting' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for mordant that I've seen before include "Bitingly sarcastic" , "Caustic" , "Acerbic" , "Waspish" , "Biting, scathing" .)

I've seen this clue in The Sun.

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