Crossword Genius

A swine behind the wheel? (4,3)

Ross

I believe the answer is:

road hog

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

'a swine behind the wheel?' is the definition.
I can't tell whether this defines the answer.

'a swine behind the wheel?' is the wordplay.
'a swine' becomes 'hog' (hog is a kind of swine).
'behind' is a charade indicator (letters next to each other).
'the wheel?' becomes 'road' (I can't explain this - if you can you should give a lot more credence to this answer).
'hog' after 'road' is 'ROAD-HOG'.

Can you help me to learn more?

(Other definitions for road hog that I've seen before include "Bad driver" , "Selfish and aggressive driver" , "menace behind the wheel" , "Driver who obstructs others" , "Reckless motorist" .)

I've seen this clue in The Mirror and The Telegraph.
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