Cold tart (6)

I believe the answer is:

bitter

This clue is a double definition.

'cold' is the first definition.
(similar in meaning)

'tart' is the second definition.
(thesaurus)

(Other definitions for bitter that I've seen before include "Beer; not sweet" , "Sour tasting, like English ale" , "Resentful or angry through disappointment" , "Sharp-tasting or resentful" , "Tart or resentful" .)

I've seen this clue in The Guardian, The Globe and Mail and the Evening Standard.

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