Prestige or seal (6)
I believe the answer is:
cachet
This clue is a double definition.
'prestige' is the first definition.
(synonyms)
'seal' is the second definition.
(I know that cachet is a type of seal)
(Other definitions for cachet that I've seen before include "Official seal - prestige" , "Feature or quality conferring prestige" , "Prestige; a stamp" , "French prestige or distinguishing mark" , "Distinguishing mark or seal" .)