Crossword Genius

Waterborne gambler? (6)

Ross

I believe the answer is:

punter

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'gambler?' is the definition.
(punter is a kind of gambler)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for punter that I've seen before include "One betting; 4's prey (slang)" , "boater" , "Informally, a customer or someone who bets" , "Person who bets" , "Gambler; customer" .)

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