Extent from side to side (5)

I think it could be either:

Which length description are you looking for?:

breadth

'extent from side to side' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for breadth that I've seen before include "Red bath (anag)" , "Extent from side to side" , "Liberal view" , "Wide measurement" , "Measurement from side to side" .)

I've seen this clue in The Irish Times.

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