Crossword Genius

Something popular with children, or the direct opposite (10)

Ross

I believe the answer is:

roundabout

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'opposite' is the definition.
Both the definition and answer are adjectives. Maybe there's a link between them I don't understand?

I can't explain the rest of the clue.

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(Other definitions for roundabout that I've seen before include "Circuitous" , "Ride" , "Traffic controller" , "Indirect" , "usually circulatory" .)

I've seen this clue in the Evening Standard.
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