One defeated (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
loser
'one defeated' is the definition.
This is all the clue.
(Other definitions for loser that I've seen before include "One who is (always) unsuccessful" , "Defeated person" , "Person who's a failure" , "Failed competitor" , "one plays without success" .)