Burrowing animal (6)
I believe the answer is:
rabbit
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">burrowing animal</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 rabbit that I've seen before include "8's friend with relations" , "See 17" , "Roger, Peter or Brer" , "Waffle" , "Come up with a solution and pull one out of the hat" .)