Revolutionary phase? (5)

I believe the answer is:

cycle

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'revolutionary phase?' is the definition.
The answer and definition can be both related to time as well as being singular nouns.
Perhaps there's an association between them I don't understand?

This is all the clue.

Can you help me to learn more?

(Other definitions for cycle that I've seen before include "Pedal-powered transport" , "Recurring series of events" , "Repeating sequence" , "Series of stories or poems" , "schedule?" .)

I've seen this clue in The Sun.

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