Soil; planet (5)
I believe the answer is:
earth
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">soil</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">planet</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(Earth is an example)</span><br/ ><br/ ></span>
(Other definitions for earth that I've seen before include "Soil; fox's lair" , "Badger's burrow" , "Familiar example of 1 Across" , "The 3rd planet from the sun" , "wire" .)