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How is wallaby surprised? (2,3,3)

Ross

I believe the answer is:

on the hop

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

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(Other definitions for on the hop that I've seen before include "Unprepared; busy" , "Be caught...to be taken unawares" , "triple-jumpers must concentrate here first" , "Be caught thus to be caught unprepared" , "Be caught . . . . . . . . to be taken unawares - on one foot?" .)

I've seen this clue in the Sydney Morning Herald.
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