Concealed or secret (6)

I believe the answer is:

covert

I believe this is a double definition.

'concealed' is the first definition.
(similar in meaning)

'secret' is the second definition.
(similar in meaning)

(Other definitions for covert that I've seen before include "Concealed, like fox's lair" , "place for game" , "Concealed, secret" , "Not acknowledged" , "in this secret place?" .)

I've seen this clue in the Sydney Morning Herald and The Mirror.

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