Hog's grunt (4)
I believe the answer is:
mine
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hog's grunt</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 mine that I've seen before include "Bomb - colliery" , "Excavate for minerals" , "Explosive device concealed in ground" , "Source of wealth" , "Excavation in the earth for digging coal etc" .)