Festoons (6)
I believe the answer is:
adorns
'festoons' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for adorns that I've seen before include "'Decorates, embellishes (6)'" , "Decorates with ornaments" , "Adds ornamentation" , "decks" , "Bedecks" .)