Extent from side to side (5)

I think it could be either:

Which length description are you looking for?:

width

'extent from side to side' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for width that I've seen before include "Sideways extent" , "Broadness" , "Thickness" , "W in volume HxLxW" , "Extent from side to side" .)

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

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