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Koala spotted there, in a predicament (2,1,3,4)

Ross

I believe the answer is:

up a gum tree

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If this is the answer I cannot explain how the clue works.

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(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" .)

I've seen this clue in The Irish Times.
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