Move like a snake (7)
I believe the answer is:
slither
'move like a snake' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for slither that I've seen before include "Move smoothly over a surface with a twisting motion" , "Undulate" , "Quietly advance" , "Slide, slip" , "Move like a snake" .)