Crossword Genius

Oarsmen from island announced (5)

Ross

I believe the answer is:

eight

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for eight that I've seen before include "What's next?" , "23" , "Number in octet" , "2 cubed" , "Where arrogance is needed" .)

I've seen this clue in The Sun.
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