Crossword Genius

Streamer's device, briefly (3)

Ross

I believe the answer is:

cam

(Other definitions for cam that I've seen before include "River also called Granta" , "Reciprocal-motion part" , "It controls the motion of engine cylinder valves" , "Rotating part in machine; river" , "Bump on a shaft for pushing another shaft" .)

I've seen this clue in the LA Times.
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