Part of speech some denounced (4)
I believe the answer is:
noun
'part of speech' is the definition.
(noun is a kind of part of speech)
'some denounced' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'NOUN' is hidden in the letters of 'denounced'.
(Other definitions for noun that I've seen before include "Word that refers to a person, place or thing" , "Word referring to person, place or thing" , "Word identifying people, things, etc" , "Content word for person, place, thing etc" , "Person, place, thing, state or quality?" .)