Crossword Genius

Parts of jellyfish sometimes seen caught with time at sea (6)

Ross

I believe the answer is:

ctenes

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'parts' is the definition.
(ctene is a kind of part)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for ctenes that I've seen is " What look like combs".)

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