Modifier of a noun (9)
I believe the answer is:
adjective
'modifier of a noun' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for adjective that I've seen before include "Word added to noun to qualify meaning" , "Qualifying or descriptive part of speech" , "Qualifier (grammar)" , "Word describing" , "Modifier of a noun" .)