Excessively hot, back without old food processor (5)
I believe the answer is:
tooth
'old food processor' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'excessively hot back without' is the wordplay.
'excessively' becomes 'ot' (I can't explain this - if you can you should believe this answer much more).
'back' says the letters should be written in reverse.
'without' means one lot of letters goes inside another.
'hot' in reverse letter order is 'toh'.
'ot' put within 'toh' is 'TOOTH'.
Can you help me to learn more?
(Other definitions for tooth that I've seen before include "Let it stand" , "It erupts" , "Bonelike structure" , "Gearwheel projection" , "Nipper" .)