Famous street's cathedral clock's descended on by top team (6,7)
I believe the answer is:
champs elysees
'famous street's' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'cathedral clock's descended on by top team' is the wordplay.
'cathedral' becomes 'ely' (cathedral city in Cambridgeshire).
'clock's' becomes 'see's' (clock can mean to see or realise).
'descended on by' is a charade indicator (letters next to each other) (in a down clue, some letters descend onto others).
'top team' becomes 'champs' (I can't explain this - if you can you should give a lot more credence to this answer).
'ely'+'sees'='elysees'
'elysees' put after 'champs' is 'CHAMPS-ELYSEES'.
Can you help me to learn more?
(Other definitions for champs elysees that I've seen before include "way, overseas" , "Parisian way" , "Heaven in Paris?" , "It runs from the Place de la Concorde to the Arc de Triomphe" , "elegant thoroughfare in Paris" .)