Call on General de Gaulle, for one (11)
I believe the answer is:
francophone
'de gaulle for one' is the definition.
I can't judge whether this definition defines the answer.
'call on general' is the wordplay.
'call' becomes 'phone' (phone can mean to call by telephone).
'on' is a charade indicator (letters next to each other).
'general' becomes 'franco' (I can't justify this - if you can you should believe this answer much more).
'phone' put after 'franco' is 'FRANCOPHONE'.
Can you help me to learn more?
(Another definition for francophone that I've seen is " French-speaking".)