Stretch old canvas (6)

I believe the answer is:

extent

'stretch' is the definition.
(I've seen this before)

'old canvas' is the wordplay.
'old' becomes 'ex' (prefix meaning former or onetime).
'canvas' becomes 'tent' (I've seen this in other clues).
'ex'+'tent'='EXTENT'

(Other definitions for extent that I've seen before include "Compass, scope" , "Degree or spread" , "Area covered by something" , "Scope, area" , "stretch" .)

I've seen this clue in The Guardian.

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