American arboreal lizards (7)
I believe the answer is:
iguanas
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">american arboreal lizards</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 iguanas that I've seen before include "Monitors" , "American arboreal lizards" , "Tropical tree lizards" , "Asia gun (anag.)" , "beasts" .)