Crossword Genius

Piston chamber (8)

Ross

I believe the answer is:

cylinder

'piston chamber' is the definition.
(synonyms)

This is all the clue.

(Other definitions for cylinder that I've seen before include "Tube-shaped object" , "Swiss-roll shape" , "Long round shape" , "Three-dimensional shape" , "Long, round figure" .)

I've seen this clue in The Times.
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