A gun lost in a backroad by the lizard (6)
I believe the answer is:
iguana
'lizard' is the definition.
(I know that iguana is a type of iguanid lizard)
'a gun lost in a backroad by' is the wordplay.
I cannot really see how this works, but
'a' could be 'an' and 'an' is present in the answer.
This explanation may well be incorrect...
'the' acts as a link.
Can you help me to learn more?
(Other definitions for iguana that I've seen before include "cold-blooded customer!" , "Arboreal lizard of S America" , "Tropical tree-lizard" , "Herbivore" , "Large lizard found in Guiana" .)