Long-tailed amphibian (10)
I believe the answer is:
salamander
'long-tailed amphibian' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for salamander that I've seen before include "Mythical fire lizard" , "portable stove" , "Tailed amphibian" , "An amphibian; fire spirit" , "amphibious creature" .)