Grimly mocking or cynical (8)

I believe the answer is:

sardonic

(Other definitions for sardonic that I've seen before include "Derisively ironic" , "Humorous in grim way - seems so rancid" , "Dry, cynically mocking" , "Heartless and bitter" , "Mocking or scornful" .)

I've seen this clue in The Mirror.

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