A swine behind the wheel? (4,3)
I believe the answer is:
road hog
'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" .)