Crossword Genius

Mechanical plunger (6)

Ross

I believe the answer is:

piston

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

This is all the clue.

(Other definitions for piston that I've seen before include "Mechanical device that has a thrusting motion" , "Valve that's instrumental" , "Block sliding in hollow cylinder in machinery etc" , "Points about driving rod" , "Driving rod in engine" .)

I've seen this clue in The Irish Times.
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