Move with difficulty (4)
I believe the answer is:
plod
'move with difficulty' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for plod that I've seen before include "Work (or walk) laboriously" , "Work painstakingly" , "Copper" , "Trudge - policeman" , "Walk slowly and laboriously" .)