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Classical maiden tripping over down with unknown speed (9)

Ross

I think it could be either:

Which length description are you looking for?:

9

4,5

woodnymph

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'classical maiden tripping' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'over down with unknown speed' is the wordplay.
I cannot really see how this works, but
'over' could be 'o' (cricket abbreviation) and 'o' is found in the answer.
an anagram of 'down' is 'wodn' which is located in the left over letters.
'unknown' could be 'y' (algebra) and 'y' is located in the answer.
'speed' could be 'mph' (miles per hour) and 'mph' is found within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Guardian.
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