Subsequently occupying an extension (4)

I believe the answer is:

'subsequently' is the definition.
(I've seen this in another clue)

'occupying an extension' is the wordplay.
'occupying' indicates a hidden word (letters for the answer occupy part of the clue).
'NEXT' can be found hidden inside 'an extension'.

(Other definitions for next that I've seen before include "Immediately following in time or order" , "Following in sequence" , "Coming immediately" , "First in line" , "Neighbour lives in the house . . . . door" .)

I've seen this clue in The Sun.

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