Queen in short time has round of intense activity (5)

I believe the answer is:

whirl

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'round of intense activity' is the definition.
(a whirl of activity)

I cannot understand how the rest of the clue works.

(Other definitions for whirl that I've seen before include "quick turn" , "Spin; social activity" , "Frantic activity" , "Feel dizzy" , "Rotate" .)

I've seen this clue in The Telegraph.

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