Crossword Genius

Off making an ascent, not caught in dicey position (3,2,1,4)

Ross

I believe the answer is:

out on a limb

'in dicey position' is the definition.
(out on a limb can mean in a risky position)

I don't understand the rest of the clue.

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

I've seen this clue in The Independent.
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