Hole in the ground (6)
I believe the answer is:
crater
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hole in the ground</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 crater that I've seen before include "big hole" , "Bowl-shaped cavity as on volcano peak" , "Hole formed by impact or explosion" , "Fissure in the earth's crust" , "Volcano's mouth" .)