Stick the forged notes inside for the foreigner (9)
I believe the answer is:
cantonese
'the foreigner' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'stick the forged notes inside' is the wordplay.
'stick' becomes 'cane' (cane is a kind of stick).
'the forged' indicates an anagram.
'inside' is an insertion indicator.
'notes' with letters rearranged gives 'tones'.
'cane' placed around 'tones' is 'CANTONESE'.
'for' is the link.
Can you help me to learn more?
(Other definitions for cantonese that I've seen before include "Chinese language" , "tongue" , "way to cook" , "such food?" , "Form of Chinese" .)