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