Crossword Genius

One-wheeled vehicle in first section of race disqualified after flipping over (7)

Ross

I believe the answer is:

sidecar

I'm a little stuck... Click here to teach me more about this clue!

'over' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'one-wheeled vehicle in first section of race disqualified after flipping' is the wordplay.
'SIDECAR' is hidden backwards in amongst the letters.
However, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for sidecar that I've seen before include "Tipple" , "passenger compartment" , "Motorcycle add-on" , "Motorbike passenger attachment" , "Attachment to motor cycle" .)

I've seen this clue in The Independent.
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