Inland navigation (5)
I believe the answer is:
canal
'inland navigation' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
This is the entire clue.
Can you help me to learn more?
(Other definitions for canal that I've seen before include "Grand Union perhaps" , "Manmade flower" , "Man-made channel of water" , "Long, narrow strip of water" , "Man-made strip of water" .)
