Crossword Genius

A heavy vehicle driver killing doctor, runs off spouting insults (7)

Ross

I believe the answer is:

abusive

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

'driver killing doctor runs off spouting insults' is the definition.
I can't judge whether this defines the answer.

'a heavy vehicle' is the wordplay.
I cannot quite see how this works, but
'a' is found in the answer.
'vehicle' could be 'bus' (public transport vehicle) and 'bus' is found within the answer.
The remaining letters 'ive' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for abusive that I've seen before include "Swearing, insulting" , "Swearing loudly" , "Reviling with coarse language" , "Vituperative" , "Criticising angrily and insultingly" .)

I've seen this clue in The Times.
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