Crossword Genius

Tennis player in river down under (6)

Ross

I believe the answer is:

murray

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

'tennis player' is the definition.
(Andy Murray)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for murray that I've seen before include "Sir James ---, first OED editor" , "Australian flower" , "British hope" , "Australian river" , "Andy --, tennis player" .)

I've seen this clue in The Sun.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.