Swamp reptile (9)

I believe the answer is:

alligator

(Other definitions for alligator that I've seen before include "Large aquatic reptile" , "Reptile of the Florida Everglades" , "Reptile akin to 1" , "Cold-blooded killer, maybe" , "Animal of the crocodile family" .)

I've seen this clue in The Sunday Times and The Times.

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