Like a snail's trail (5)
I believe the answer is:
slimy
'like a snail's trail' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for slimy that I've seen before include "Glutinous" , "Oleaginous" , "toadying" , "Repulsively obsequious" , "Covered with slippery stuff, say mud" .)