Contemptible person lots backed (4)
I believe the answer is:
snot
'contemptible person' is the definition.
The answer and definition can be both body parts as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'lots backed' is the wordplay.
'lots' becomes 'tons' (synonyms).
'backed' says the letters should be written backwards.
'tons' reversed gives 'SNOT'.
Can you help me to learn more?
(Other definitions for snot that I've seen before include "Contemptible type" , "Mucus" , "Dog" .)