Organic material (5)
I believe the answer is:
humus
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">organic material</span>' is the definition.<br/ ><span class="explanation-format__explanation">(component of soil)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for humus that I've seen before include "appetiser" , "Organic component of soil" , "garden material" , "Organic "fertiliser"" , "Compost" .)