Descriptive name (7)
I believe the answer is:
epithet
'descriptive name' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for epithet that I've seen before include "Descriptive adjective" , "Appellation" , "What characterises" , "Phrase expressing some quality of a person or thing" , "Adjective expressing some quality of a person" .)