Crossword Genius

Engine part (6)

Ross

There are a few possibilities for this:

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3

6

8 3-4

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

This is all the clue.

(Other definitions for piston that I've seen before include "Part of a machine with a plunging motion" , "Points about driving rod" , "Trumpet part" , "Brass instrument valve" , "Transmitter of motion from camshaft to valve" .)

I've seen this clue in The Mirror and The Star Tribune.
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