Channel (4)
'channel' is the definition.
(I know that strait is a type of channel)
This is the entire clue.
(Other definitions for strait that I've seen before include "-- -laced (prudish)" , "Difficulty - strict" , "Narrow strip of water between two larger ones" , "Narrow sea passage" , "Difficult state for artist" .)
'channel' is the definition.
(I know that channel can be written as groove)
This is the entire clue.
(Other definitions for groove that I've seen before include "Cutting" , "Cut channel - set routine" , "Get down" , "Spiral track followed by a gramophone needle" , "Long narrow channel or kind of rut" .)
'channel' is the definition.
(I know that channel can be written as duct)
This is the entire clue.
(Other definitions for duct that I've seen before include "Enclosed conduit for fluid" , "Pipe for cables or air" , "Tube for conveing cable, liquid etc" , "Pipe, tube" , "The Eve of St - is a narrative poem by Keats" .)
'channel' is the definition.
(culvert is a kind of channel)
This is all the clue.
(Other definitions for culvert that I've seen before include "Drain tunnel" , "Drainage tunnel" , "Under-road drain" , "Covered drain" , "Water channel" .)
'channel' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for estuary that I've seen before include "Wide river mouth" , "Where tide meets stream" , "Type of English" , "Broad river mouth" , "Wide river-mouth" .)
'channel' is the definition.
(synonyms)
This is all the clue.
(Other definitions for conduit that I've seen before include "Channel for wiring" , "Channel for conveying liquid" , "Channel for conveying liquids" , "Pipe for fluid - means of access" , "Duct" .)