Agreement’s peculiar language about kitchen appliance (8)
I believe the answer is:
covenant
'agreement's' is the definition.
(covenant is a kind of agreement)
'peculiar language about kitchen appliance' is the wordplay.
'peculiar language' becomes 'cant' (cant is a kind of language. I am not sure about the 'peculiar' bit.).
'about' is an insertion indicator.
'kitchen appliance' becomes 'oven' (oven is a kind of kitchen appliance).
'cant' enclosing 'oven' is 'COVENANT'.
Can you help me to learn more?
(Other definitions for covenant that I've seen before include "Signed agreement between two or more to do something" , "Pact" , "Formal agreement of contract" , "Formal binding agreement" , "Binding contract" .)