Escargot (5)
I believe the answer is:
snail
'escargot' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for snail that I've seen before include "Slow slithery animal" , "Common garden mollusc" , "Not one of the fleet" , "Slow slithery mollusc" , "Gastropod mollusc" .)