Extremely lazy (4,4)
I believe the answer is:
bone idle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">extremely lazy</span>' is the definition.<br/ ><span class="explanation-format__explanation">(bone idle means very lazy)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for bone idle that I've seen before include "Really lazy in ossified way" , "Extremely lazy" , "Very lazy, from the marrow out" , "Very lazy, may be ossified?" , "Not lifting a finger" .)