Sample covering old kitchen appliance (7)
I believe the answer is:
toaster
'appliance' is the definition.
(toaster is a kind of appliance)
'sample covering old kitchen' is the wordplay.
'sample' becomes 'taster' (I've seen this before).
'covering' means one lot of letters goes inside another.
'old kitchen' becomes 'o' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'taster' placed around 'o' is 'TOASTER'.
Can you help me to learn more?
(Other definitions for toaster that I've seen before include "Machine for making brown bread?" , "Electrical kitchen appliance" , "Best man" , "Kitchen gadget" , "Kitchen device" .)