Setting agent notes on language (7)
I believe the answer is:
gelatin
'setting agent' is the definition.
The answer and definition can be both substances as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'notes on language' is the wordplay.
'notes on' becomes 'ge' (I am not sure about the 'on' bit.).
'language' becomes 'latin' (Latin is an example).
'ge'+'latin'='GELATIN'
Can you help me to learn more?
(Other definitions for gelatin that I've seen before include "something gluey" , "Jelling agent" , "Thickener" , "Food/glue jelly" , "Colourless protein extracted from animal bones" .)