Crossword Genius

Vigorous emcee staying out (9)

Ross

I believe the answer is:

gymnastic

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'vigorous' is the definition.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for gymnastic that I've seen before include "Involving exercises" , "Very agile" .)

I've seen this clue in the Sydney Morning Herald.
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