Possible Clues:

• It's characteristic of the South for the water not to be wide there (6)
• At last it has the characteristic of being narrow (6)
• Not the ocean wide - nor crooked, by the sound of it
• Narrow sea-channel
• Narrow or difficult
• Sound honest to the listener
• Not broadly speaking it sounds as if there's not a corner here
• A waterway without water, we're told
• Narrows definition of second feature
• No honest broads there, by the sound of it