Glad rags (6)
I believe the answer is:
finery
'glad rags' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for finery that I've seen before include "Regalia" , "Glad rags, best duds" , "Elaborate clothes and accessories" , "Fancy clothes or trappings" , "Ostentatious clothing" .)