Look both ways (4)

I think it could be either:

Which length description are you looking for?:

peep

I believe this is a double definition.

'look' is the first definition.
(peep can mean to look at something)

'both ways' is the second definition.

(Other definitions for peep that I've seen before include "Look furtively (either way)" , "Chirp" , "Secret look" , "Spy" , "Peek" .)

I've seen this clue in The Guardian, The Mirror, the Sydney Morning Herald and the Evening Standard.

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