Adjective (7)
I believe the answer is:
epithet
'adjective' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for epithet that I've seen before include "Descriptive term or short phrase" , "Phrase expressing some quality of a person or thing" , "Appellation" , "The 23: an -- for Richard I" , "qualifier" .)