Crossword Genius

Cylindrical moving part in an engine (6)

Ross

I believe the answer is:

piston

(Other definitions for piston that I've seen before include "Transmitter of motion from camshaft to valve" , "Brass instrument valve" , "Mechanical device that has a thrusting motion" , "Sliding piece in a cylinder" , "A moving part of car engine" .)

I've seen this clue in The Sun.
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