One who fights with the French king after all others (8)
I believe the answer is:
wrestler
'one who fights' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'with the french king after all others' is the wordplay.
'with' becomes 'w' (abbreviation**).
'the french' becomes 'le'.
'king' becomes 'r' (r is abbreviation for rex).
'after' is a charade indicator (letters next to each other).
'all others' becomes 'rest' (as in the rest of a group).
'le'+'r'='ler'
'ler' put after 'rest' is 'restler'.
'w'+'restler'='WRESTLER'
Can you help me to learn more?
(Other definitions for wrestler that I've seen before include "Athlete trying to pin opponent to the ground" , "Professional fighter" , "Fight contestant" , "Fighter who holds and throws" , "Ring fighter" .)