Defensive stronghold; redoubt (4)

I believe the answer is:

fort

I believe this clue is a double definition.

'defensive stronghold' is the first definition.
(I've seen this before)

'redoubt' is the second definition.
(thesaurus)

(Other definitions for fort that I've seen before include "Defensive stronghold" , "Military post in the old West" , "& 22 US Army post" , "Military building" , "Citadel" .)

I've seen this clue in The Guardian.

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