Crossword Genius

In a position without others' support (3,2,1,4)

Ross

I believe the answer is:

out on a limb

(Other definitions for out on a limb that I've seen before include "questionably placed" , "Alone and in danger" , "Exposed, vulnerable" , "In a vulnerable position" , "Wing-walking" .)

I've seen this clue in The Times.
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