Long-tailed amphibian (10)
I believe the answer is:
salamander
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">long-tailed amphibian</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 salamander that I've seen before include "Mythical fire lizard" , "portable stove" , "Tailed amphibian" , "An amphibian; fire spirit" , "amphibious creature" .)