Time-honored (7)
I believe the answer is:
classic
'time-honored' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for classic that I've seen before include "Very great work of art" , "Of recognized excellence" , "The Derby or The Oaks, for example" , "Top-quality" , "Judged over a long period to be of high quality" .)