Crossword Genius

Reportedly an island crew (5)

Ross

I believe the answer is:

eight

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'crew' is the definition.
(an eight-person rowing team)

I don't 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 "Number (with pieces?)" , "Mathematical cube" , "team rowing" , "Set of rowers" , "Oxygen's atomic number" .)

I've seen this clue in The Sun.
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