Crossword Genius

Regarding only child reversing Range Rover? (5)

Ross

I believe the answer is:

bison

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

'range rover?' is the definition.
(I've seen this in another clue)

'regarding only child reversing' is the wordplay.
I cannot really see how this works, but
'regarding' could be 'on' (on or regarding a particular topic) and 'on' is located in the answer.
The remaining letters 'bis' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for bison that I've seen before include "Ox-like ruminant" , "US prairie cattle" , "O bins could be full of buffalo" , "Buffalo (US)" , "It's a buffalo in America" .)

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