Note on West African country's language (6)
I believe the answer is:
somali
'language' is the definition.
(Somali is an example)
'note on west african country's' is the wordplay.
'note' becomes 'so' (musical note**).
'on' is a charade indicator (letters next to each other).
'west african country' becomes 'mali' (I've seen this before).
'so'+'mali'='SOMALI'
(Other definitions for somali that I've seen before include "1 [GCSE]" , "native language" , "So Liam could be a man from NE Africa" , "African language" , "From a part of northeast Africa" .)