Crossword Genius

Started on the green and accelerated away (5,3)

Ross

I believe the answer is:

drove off

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

'started' is the definition.
The definition and answer can be both related to competing as well as being past participle verbs.
Maybe you can see a link between them that I can't see?

'the green and accelerated away' is the wordplay.
I cannot quite understand how this works, but
'away' could be 'off' ('off' can be a synonym of 'away') and 'off' is present in the answer.
The remaining letters 'drove' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'on' is the link.

Can you help me to learn more?

I've seen this clue in The Globe and Mail.
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