Crossword Genius

Adjust model's front wheels, not working without key (7)

Ross

I believe the answer is:

twiddle

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

'adjust' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for twiddle that I've seen before include "Finger idly" , "Tinker with" , "Idly rotate (one's thumbs?)" , "Play with and twist around" , "Turn in a purposeless way" .)

I've seen this clue in The Guardian.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.