Trough (6)
'trough' is the definition.
(I know that trough can be written as gutter)
This is the entire clue.
(Other definitions for gutter that I've seen before include "Channel at the side of a street" , "Where snipe can be found" , "Drainage channel" , "Someone removing contents" , "Roadside channel" .)
(Other definitions for manger that I've seen before include "Container from which horses feed" , "Cattle-feeding trough" , "Fixture in stable" , "Kind of stable trough, famous from Bethlehem" , "Trough for cattle-feed" .)