Crossword Genius

Criminal who's too quick touching bottoms up (7)

Ross

I believe the answer is:

speeder

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

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

Can you help me to learn more?

(Another definition for speeder that I've seen is " One going too fast".)

I've seen this clue in The Independent.
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