Line up (5)

I think it could be either:

Which length description are you looking for?:

3,2,1,4

align

'line up' is the definition.
(synonyms)

This is all the clue.

(Other definitions for align that I've seen before include "Straighten in relation to others" , "Regulate, arrange in line" , "Set in order" , "Put in order" , "Arrange so as to be parallel" .)

I've seen this clue in The Telegraph, The Times and the Evening Standard.

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