Beaver's project (3)
I believe the answer is:
dam
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">beaver's project</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 dam that I've seen before include "Water retainer" , "Reservoir barrier" , "Mad as an animal mum" , "A mad animal mother" , "Flood barrier" .)