Small lizard (5)
I believe the answer is:
gecko
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">small lizard</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 gecko that I've seen before include "Malaysian climber" , "Cold-blooded creature" , "one climbing the walls?" , "Lizard than can't blink" , "House lizard" .)