Crossword Genius

Secret police's unchanging state (6)

Ross

I believe the answer is:

stasis

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This clue could be a double definition.

'secret police's' is the first definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'unchanging state' is the second definition.

Can you help me to learn more?

(Other definitions for stasis that I've seen before include "No progressive state" , "Secret police force's" , "Stoppage of blood flow in body" , "State of inactivity where nothing moves" , "Assist in state of stagnation" .)

I've seen this clue in the Private Eye and The Guardian.
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