Something in the kitchen during demo contained spirit (10)
I believe the answer is:
kettledrum
'something in the kitchen during demo' is the definition.
I can't tell whether this definition defines the answer.
'contained spirit' is the wordplay.
'contained' becomes 'kettled' (I can't explain this - if you can you should believe this answer much more).
'spirit' becomes 'rum' (alcoholic spirit).
'kettled'+'rum'='KETTLEDRUM'
Can you help me to learn more?
(Other definitions for kettledrum that I've seen before include "Orchestral instrument" , "one beaten with sticks" , "One beaten by player" , "thing to produce tattoo" , "Part of kitchen" .)