Person, place or thing, in grammar (4)
I believe the answer is:
noun
'person place or thing in grammar' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for noun that I've seen before include "Category of word" , "Type of word" , "Word identifying people, things, etc" , "Part of speech identifying a person, place or thing" , "Word that refers to a person, place or thing" .)