Koala spotted there, in a predicament (2,1,3,4)
I believe the answer is:
up a gum tree
If this is the answer I cannot explain how the clue works.
Can you help me to learn more?
(Other definitions for up a gum tree that I've seen before include "In a sticky position" , "in trouble" , "In difficulty" , "Where koala may be" , "In a sticky situation" .)