Dam-building animal (6)
I believe the answer is:
beaver
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">dam-building animal</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 beaver that I've seen before include "Dam-builder" , "Brown, furry rodent" , "tree-feller" , "Lodge-builder" , "Facial protection" .)