"Les Misérables" escape route (5)
I believe the answer is:
sewer
'les miserables escape route' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sewer that I've seen before include "Pipe for carrying away waste matter" , "Embroiderer; soil pipe" , "Pipe to carry away waste matter" , "Large pipe for carrying waste matter" , "Drainage channel" .)