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Old warships with three sets of propellers (8)

Ross

I believe the answer is:

triremes

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

'old warships' is the first definition.
'triremes' can be an answer for 'warships'. I am not certain of the 'old' bit.

'three sets of propellers' is the second definition.
I know that 'three' relates to this answer.

'with' acts as a link.

Can you help me to learn more?

(Other definitions for triremes that I've seen before include "boats" , "Galleys" , "They had three banks" .)

I've seen this clue in The Globe and Mail.
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