"Constrictor" snake (3)
I believe the answer is:
boa
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">constrictor snake</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 boa that I've seen before include "Python" , "Large constrictor snake" , "Snake; feather stole" , "S American snake that crushes its prey" , "native American" .)