Like exhausted kangaroos that mustn’t be touched (3,2,6)
I believe the answer is:
out of bounds
'kangaroos that mustn't be touched' is the definition.
I can't tell whether this defines the answer.
'like exhausted' is the wordplay.
I cannot really understand how this works, but
'exhausted' could be 'out' (out can mean empty or exhausted) and 'out' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for out of bounds that I've seen before include "lying beyond field of play?" , "Skipper so exhausted" , "taboo" , "like an exhausted kangaroo?" , "Off limits" .)