Crossword Genius

Understand it will rock as one gets up speed (7,3)

Ross

I believe the answer is:

gathers way

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

'one gets up speed' is the definition.
I know nothing about this answer so I can't judge whether this works.

'understand it will rock' is the wordplay.
I cannot really see how this works, but
'understand' could be 'gather' (synonyms) and 'gather' is present in the answer.
'rock' could be 'sway' (synonyms) and 'sway' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

'as' is the link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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