Everglades denizen (9)
I believe the answer is:
alligator
'everglades denizen' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for alligator that I've seen before include "Large carnivorous reptile" , "Predatory cold-blooded killer" , "Cold-blooded killer, maybe" , "From fearsome beast" , "Dangerous creature" .)