French footballer, mostly with no difficulty, picked up foreign language (9)
I believe the answer is:
cantonese
'language' is the definition.
(Cantonese is an example)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for cantonese that I've seen before include "tongue" , "such food?" , "Oriental" , "Chinese language" , "Asian language?" .)