Crossword Genius

What one lacking drive might need to move forwards? (3,4)

Ross

I believe the answer is:

tow rope

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

'what one lacking drive might' is the definition.
I know nothing about this answer so I can't judge whether this works.

'to move forwards?' is the wordplay.
I cannot quite understand how this works, but
'to' is present in the answer.
This explanation may well be incorrect...

'need' acts as a link.

Can you help me to learn more?

(Another definition for tow rope that I've seen is " cable".)

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