Legless reptile (5)
I believe the answer is:
snake
'legless reptile' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for snake that I've seen before include "For instance, adder" , "former EC currency band" , "Chinese zodiac animal" , "Entertainer with music and reptiles" , "Part of plant or hair" .)