Uncastrated male pig (4)
I believe the answer is:
boar
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">uncastrated male pig</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for boar that I've seen before include "Sow's mate" , "Uncastrated male hog" , "The head for drink Falstaff had" , "Wild pig sounds tedious" , "Wild animal, sounds like drill" .)