Crossword Genius

The very thing left by critical attack when the axe drops? (4,3,3)

Ross

I believe the answer is:

just the job

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'the very thing' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for just the job that I've seen before include "Exact requirement" , "fine!" , "The position is all" , "The very thing" , "Exactly what is needed" .)

I've seen this clue in The Guardian.
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