Wall-climbing lizard (5)
I believe the answer is:
gecko
'wall-climbing lizard' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for gecko that I've seen before include "Cold-blooded creature" , "one climbing the walls?" , "Small tropical lizard" , "Type of lizard" , "Lizard with adhesive toes" .)