Catches stray snail (5)
I believe the answer is:
nails
'catches' is the definition.
(I've seen this in another clue)
'stray snail' is the wordplay.
'stray' is an anagram indicator.
'snail' with letters rearranged gives 'NAILS'.
(Other definitions for nails that I've seen before include "Metal fasteners" , "Fixes" , "Cock's crest" , "Part of body; hard as them" , "Claws" .)