A French snail (8)
I believe the answer is:
escargot
'a french snail' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for escargot that I've seen before include "French delicacy" , "Edible snail (from Fr.)" , "One continually moving house" , "An edible snail from France" , "French food" .)