Crossword Genius

What butcher might sell in haste? (4-4)

Ross

I believe the answer is:

chop-chop

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'what' is the definition.
Both the answer and definition are adverbs.
Perhaps they are linked in a way I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for chop-chop that I've seen before include "Hurry up!" , "Quickly!" , "Get a move on!" .)

I've seen this clue in the Sydney Morning Herald.
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