Fertile soil (4)
I believe the answer is:
loam
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fertile soil</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for loam that I've seen before include "Rich soil containing decayed matter" , "Rich soil consisting of a mixture of sand, clay and decaying organic materials" , "A rich fertile soil" , "Type of soil" , "Rich soil, good for growing" .)