Following from main extent (4)

I believe the answer is:

'following' is the definition.
(I know that following can be written as next)

'from main extent' is the wordplay.
'from' says the answer is hidden in the clue.
'NEXT' is hidden within 'main extent'.

(Other definitions for next that I've seen before include "The one following or adjacent" , "Succeeding" , "Retailer" , "Nearest following" , "Closest" .)

I've seen this clue in The Mirror.

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