What you hope to see through sunglasses? Water in Cannes, having just arrived there (7)
I believe the answer is:
nouveau
'cannes having just arrived there' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'what you hope to see through sunglasses? water' is the wordplay.
I cannot really see how this works, but
'you' could be 'u' (commonly used in online communication) and 'u' is present in the answer.
'see' could be 'v' (short for 'vide', Latin meaning 'see elsewhere') and 'v' is found in the answer.
'water' could be 'eau' (I have seen 'French water ' mean 'eau' so perhaps 'water' could also mean 'eau') and 'eau' is present in the answer.
The remaining letters 'no' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'in' acts as a link.
Can you help me to learn more?
(Other definitions for nouveau that I've seen before include "latest" , "like young Beaujolais" , "It's new in France" , "up to date" , "New to the French" .)