Crossword Genius

Length, extent (4)

Ross

I believe the answer is:

span

I believe this is a double definition.

'length' is the first definition.
(I know that span is a type of length)

'extent' is the second definition.
(I have seen 'Extent of 20 ' mean 'span' so perhaps 'extent' could also mean 'span')

(Other definitions for span that I've seen before include "Team of two matched oxen" , "Distance or interval between two points" , "Go across" , "Stretch; traverse" , "Extent - 9 inches" .)

I've seen this clue in The Guardian.
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