Language of money (7)
I believe the answer is:
guarani
This might be a double definition.
'language' is the first definition.
(Guarani is an example)
'money' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for guarani that I've seen before include "South American Indian language" , "S. Am. Indian people" .)