Largest extant lizard (6,6)
I believe the answer is:
komodo dragon
'largest extant lizard' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for komodo dragon that I've seen before include "Large Indonesian lizard" , "Indonesian monitor lizard" , "Largest extant lizard" , "Large endangered lizard" , "Indonesian monster lizard" .)