Tennis player in river down under (6)
I believe the answer is:
murray
'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" .)