A no-no, like whacked kangaroo? (3,2,6)
I believe the answer is:
out of bounds
I'm afraid I can't even guess how this answer relates to the clue.
Can you help me to learn more?
(Other definitions for out of bounds that I've seen before include "Skipper so exhausted" , "taboo" , "Off limits" , "like an exhausted kangaroo?" , "lying beyond field of play?" .)