Crossword Genius

With Ecstasy gone, supply crack (4)

Ross

I believe the answer is:

quip

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'crack' is the definition.
(both can mean a joke)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for quip that I've seen before include "Brief witty saying" , "West African country" , "Bon mot" , "Smart remark" , "Part of the psyche" .)

I've seen this clue in The Times.
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