Cul-de-sac (2,7,4)

I think it could be either:

Which length description are you looking for?:

2,7,4

no through road

'cul-de-sac' is the definition.
(I know that cul-de-sac can be written as no through road)

This is the entire clue.

(Another definition for no through road that I've seen is " notice at side of track".)

I've seen this clue in The Guardian.

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