Revolutionary children's entertainer? (10)

I believe the answer is:

roundabout

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This might be a double definition.

'revolutionary' is the first definition.
Both the definition and answer are adjectives. Maybe you can see an association between them that I don't see?

'children's entertainer?' is the second definition.

Can you help me to learn more?

(Other definitions for roundabout that I've seen before include "A plaything" , "Indirect" , "Traffic controller" , "Circuitous" , "Roughly" .)

I've seen this clue in The Telegraph.

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