Iguana feature (6)
I believe the answer is:
dewlap
'iguana feature' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for dewlap that I've seen before include "Fold of loose skin that hangs below the neck" , "Throat's loose skin" , "Fold hanging beneath animal's throat" , "Fold of loose skin on some old necks" , "Fold of skin drooping under chin" .)