Window of gold by the sea in Cannes? (6)
I believe the answer is:
dormer
'window' is the definition.
(dormer is a kind of window)
'gold by the sea in cannes?' is the wordplay.
I cannot quite understand how this works, but
'gold' could be 'or' ('or' is the heraldic name for gold) and 'or' is present in the answer.
'sea' could be 'mer' (I have seen 'French sea ' mean 'mer' so perhaps 'sea' could also mean 'mer') and 'mer' is found in the answer.
A single letter 'd' remains which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
'of' is the link.
(Other definitions for dormer that I've seen before include "Upright window built out from a sloping roof" , "Light" , "Kind of window under gable" , "Type of window set in sloping roof" , "Window projecting vertically from a sloping roof" .)