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Careless tree-lopper might be so vulnerable! (3,2,1,4)

Ross

I believe the answer is:

out on a limb

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'vulnerable' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

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(Other definitions for out on a limb that I've seen before include "Wing-walking" , "In a vulnerable position" , "Without support" , "In a precarious position" , "Alone and in danger" .)

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