Watercourse (5)
'watercourse' is the definition.
(I know that river is a type of watercourse)
This is all the clue.
(Other definitions for river that I've seen before include "Tributary" , "Waterway" , "eg Aire" , "x or y, so to speak" , "Eg, Severn" .)
(Other definitions for canal that I've seen before include "eg Grand Union" , "navigate this?" , "Duct" , "Passage" , "Man-made watercourse" .)
'watercourse' is the definition.
(I know that watercourse can be written as stream)
This is the entire clue.
(Other definitions for stream that I've seen before include "One small river" , "Running liquid" , "Brook, burn" , "Master of a tributary" , "Transmit music or video online" .)