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