Little island person finds reptile (6)
I believe the answer is:
cayman
'reptile' is the definition.
(cayman is a kind of reptile)
'little island person' is the wordplay.
'little island' becomes 'cay' (I've seen this in another clue).
'person' becomes 'man' (man is a kind of person).
'cay'+'man'='CAYMAN'
'finds' is the link.
(Other definitions for cayman that I've seen before include "Fearsome creature" , "Alligator - island" , "Alligator-like reptile; Amy can (anagram)" , "Crocodilian animal" , "Aquatic reptile" .)