Crossword Genius

A twister does so suddenly, perhaps painfully (6)

Ross

I believe the answer is:

tweaks

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'a twister does' is the definition.
Although both the answer and definition are verbs in their -s form, I cannot see how they can define each other.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for tweaks that I've seen before include "Pinches and twists, perhaps nose" , "Makes little adjustments" , "Improves a little" , "Pinches and twists, maybe a nose" , "Pinches and twists sharply" .)

I've seen this clue in the Evening Standard.
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