Channel to carry away rainwater (6)
I believe the answer is:
gutter
'channel to carry away rainwater' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for gutter that I've seen before include "Element 46; a London theatre" , "Channel at the side of a street" , "Channel for carrying off water" , "Someone removing contents" , "Street channel for carrying off rainwater" .)