Thus can Algeria provide a navigable channel (5)
I believe the answer is:
canal
'channel' is the definition.
(I know that channel can be written as canal)
'thus can algeria provide a navigable' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' is found within the answer.
The remaining letters 'cal' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for canal that I've seen before include "Man-made watercourse" , "Man-made channel of water" , "Artificial waterway for barges" , "Duct" , "Aqueduct" .)