Crossword Genius

You have to say check time the PM’s in power? (5)

Ross

I believe the answer is:

reign

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'power?' is the definition.
(reign can mean time in power)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for reign that I've seen before include "Rule as king or queen" , "Be champion" , "Period during which someone is dominant" , "Dominion" , "Govern" .)

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