Cabal originally taking over area after thirty days (5)

I believe the answer is:

junta

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'cabal' is the definition.
(synonyms)

I don't understand the remainder of the clue.

(Other definitions for junta that I've seen before include "Military regime" , "Group heading a military government" , "Group seizing power" , "Ruling group of military officers" , "Military clique of rulers" .)

I've seen this clue in The Times.

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