Lizards with dewlaps (7)
I believe the answer is:
iguanas
'lizards with dewlaps' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for iguanas that I've seen before include "American arboreal lizards" , "Asia gun (anag.)" , "Tropical tree lizards" , "tropical natives" , "Large lizards" .)