Undiscoverable, missing boulevards on the French Mediterranean (4)
I believe the answer is:
nice
'the french mediterranean' is the definition.
Although both the answer and definition are adjectives, I don't understand how they can define each other.
'undiscoverable missing boulevards' is the wordplay.
'missing' indicates named letters should be taken away.
'undiscoverable' with 'boulevards' taken out is 'NICE'.
'on' is the link.
Can you help me to learn more?
(Other definitions for nice that I've seen before include "Portuguese river, a centre for port" , "French Mediterranean resort" , "Agreeable -- subtle" , "French resort; pleasing" , "Attractive Mediterranean resort" .)