Means of support (4)
(Other definitions for legs that I've seen before include "Sections of a journey or course" , "Lower limbs" , "Stages of a journey" , "associated with 11 in game" , "Members" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">means of support</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for bread and butter that I've seen before include "pudding" , "basically reliable" , "Means of support" , "Food" , "rather monotonous diet" .)