Crossword Genius

Off-roader provided by Spooner's bosses at the BBC (4,4)

Ross

I believe the answer is:

dirt bike

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'off-roader' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Another definition for dirt bike that I've seen is " scrambling machine".)

I've seen this clue in The Independent.
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