Lizard or snake (7)
I believe the answer is:
reptile
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">lizard</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">snake</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for reptile that I've seen before include "Snake or crocodile, say" , "Cold-blooded creature" , "Unpleasant character" , "Serpent" , "Eg, snake, lizard, etc" .)