Crossword Genius

Cracker put together quickly (5,3)

Ross

I believe the answer is:

knock out

I believe this clue is a double definition.

'cracker' is the first definition.
(both can mean something excellent)

'put together quickly' is the second definition.
(as in knocking out a piece of work)

(Other definitions for knock out that I've seen before include "Eliminate" , "Stun - defeat - destroy" , "Render senseless" .)

I've seen this clue in The Times.
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