I am an expert on the Chinese lingo — it's so complicated (10)
I believe the answer is:
sinologist
'i am an expert on the chinese' is the definition.
(Sinology is the study of China)
'lingo it's so complicated' is the wordplay.
'complicated' indicates anagramming the letters (a complex or confusing ordering of the letters).
'lingo'+'its'+'so'='lingoitsso'
'lingoitsso' with letters rearranged gives 'SINOLOGIST'.
(Other definitions for sinologist that I've seen before include "Chinese scholar" , "Expert on China" .)