Descriptive term (7)
I believe the answer is:
epithet
'descriptive term' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for epithet that I've seen before include "Phrase expressing some quality of a person or thing" , "What characterises" , "Descriptive word or phrase added to a name" , "Word describing" , "Adjective expressing some quality of a person" .)