Crossword Genius

Water clock (9)

Ross

I believe the answer is:

clepsydra

'water clock' is the definition.
(synonyms)

This is all the clue.

(Other definitions for clepsydra that I've seen before include "Ancient water clock" , "old time technology" , "Old timekeeper needing water" , "Water-clock" , "timer" .)

I've seen this clue in The Times and The Sunday Times.
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