Key point (4)

I think it could be either:

Which length description are you looking for?:

4,4

crux

'key point' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for crux that I've seen before include "puzzle" , "Essence or gist" , "Nub" , "The most important thing" , "Essential point in the matter or problem" .)

I've seen this clue in The Times and The Sunday Times.

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