Relative of a gator (4)
I believe the answer is:
croc
'relative of a gator' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for croc that I've seen before include "Small reptile" , "Predatory reptile (informal)" , "Small animal" , "Predatory reptile (abbr)" , "that might be sitting on your foot" .)