Male swine (4)
I believe the answer is:
boar
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">male swine</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for boar that I've seen before include "Sow's mate" , "Male swine" , "Wild swine" , "The head for drink Falstaff had" , "Resting place for birds or bats" .)