Crossword Genius

Reversible machine part? (3)

Ross

I believe the answer is:

cam

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

'machine part?' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for cam that I've seen before include "Runner" , "It controls the motion of engine cylinder valves" , "Projection on rotating shaft imparting motion" , "Shaft on a rotating part in machinery" , "University city's river" .)

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