Holey lightweight shoe (4)
I believe the answer is:
croc
'holey lightweight shoe' 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" , "Large, bony-plated reptile (abbr)" , "Wild animal" , "Pot tailless" , "Predatory reptile (abbr)" .)