Colour-changing lizard (9)
I believe the answer is:
chameleon
'colour-changing lizard' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for chameleon that I've seen before include "Lizard whose skin changes colour" , "Someone who changes position to suit the situation" , "Colour-changing lizard" , "Lizard able to change its skin colour" , "Animal that changes colour" .)