Captured at work (8)

I believe the answer is:

occupied

This clue is a double definition.

'captured' is the first definition.
(e.g. an occupied country or castle)

'at work' is the second definition.
(thesaurus)

(Other definitions for occupied that I've seen before include "Full; working" , "Busy or inhabited" , "Lived in" , "Inhabited, held" , "In enemy hands" .)

I've seen this clue in The Telegraph.

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