Stoat-like mammal (6)
I believe the answer is:
weasel
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">stoat-like mammal</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 weasel that I've seen before include "Carnivore -- saw eel (anag)" , "Animal; sly person" , "Stoat-like mammal - treacherous type" , "Predator" , "One deceiving" .)