Labyrinth (4)
I believe the answer is:
maze
'labyrinth' is the definition.
(I know that labyrinth can be written as maze)
This is all the clue.
(Other definitions for maze that I've seen before include "Puzzling network of paths" , "Complex set of paths" , "Complicated network of paths, a labyrinth" , "Network of hedges to get lost in" , "Labyrinth of paths and hedges to get lost in" .)