Seal — prestige (6)
I believe the answer is:
cachet
I believe this clue is a double definition.
'seal' is the first definition.
(I know that seal can be written as cachet)
'prestige' is the second definition.
(synonyms)
(Other definitions for cachet that I've seen before include "Official seal - prestige" , "French prestige or distinguishing mark" , "Distinguishing feature" , "Mark of approval" , "(Mark of) distinction" .)