Expert witticism (5)

I believe the answer is:

crack

I believe this clue is a double definition.

'expert' is the first definition.
(as in 'a crack team')

'witticism' is the second definition.
(I've seen this in another clue)

(Other definitions for crack that I've seen before include "Brilliant" , "Very skilful" , "Opening; sharp blow" , "Joke; split" , "bang" .)

I've seen this clue in The Globe and Mail.

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