Gator relative (4)
I believe the answer is:
croc
'gator relative' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for croc that I've seen before include "that might be sitting on your foot" , "Predatory reptile (abbr)" , "Long-tailed reptile (abbr)" , "Large, bony-plated reptile (abbr)" , "Small reptile" .)