The leopard spooked hoon (10)

I believe the answer is:

petrolhead

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

'hoon' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see a link between them that I don't see?

'the leopard spooked' is the wordplay.
'the leopard' can be anagrammed to 'PETROLHEAD'.
Though, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for petrolhead that I've seen before include "Motoring fanatic" , "Car lover" .)

I've seen this clue in the Sydney Morning Herald.

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