Cutting pastry dish (4)

I believe the answer is:

tart

I believe this is a double definition.

'cutting' is the first definition.
(both can mean sharp or sarcastic)

'pastry dish' is the second definition.
(type of pastry product)

(Other definitions for tart that I've seen before include "Sort of girl" , "Astringent" , "Open cake with jam etc" , "Sharp or sour in taste" , "Filled pastry dish" .)

I've seen this clue in The Times.

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