Enclosed channel (4)
I believe the answer is:
duct
(Other definitions for duct that I've seen before include "The Eve of St - is a narrative poem by Keats" , "Air passage" , "Pipe, tube" , "Tube for cables, air, etc" , "Channel" .)
I believe the answer is:
duct
(Other definitions for duct that I've seen before include "The Eve of St - is a narrative poem by Keats" , "Air passage" , "Pipe, tube" , "Tube for cables, air, etc" , "Channel" .)