Fish waiters finally sell in French city (7)
I believe the answer is:
anglers
'fish waiters finally' is the definition.
I can't tell whether this definition defines the answer.
'sell in french city' is the wordplay.
'sell' becomes 'l' (I can't explain this - if you can you should give a lot more credence to this answer).
'in' indicates putting letters inside.
'french city' becomes 'angers' (Angers is a city in France).
'l' going inside 'angers' is 'ANGLERS'.
Can you help me to learn more?
(Other definitions for anglers that I've seen before include "Fishermen" , "People fishing" .)