In a precarious position (2,4,3)
I think it could be either:
on thin ice
(Other definitions for on thin ice that I've seen before include "that can make one vulnerable" , "sailing close to the wind?" , "In a precarious situation" , "in danger of a soaking?" , "At risk" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">in a precarious position</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for out on a limb that I've seen before include "Exposed, vulnerable" , "In a precarious position" , "In a vulnerable position" , "questionably placed" , "Alone and in danger" .)