Crossword Genius

Signal to remain indoors (6)

Ross

I believe the answer is:

curfew

(Other definitions for curfew that I've seen before include "Order restricting movements after a set time" , "when it's time to go home" , "Early closing time imposed by military" , "Restriction on going out" , "restraining order" .)

I've seen this clue in The Guardian.
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