Plunder so arranged shows radiance (9)
I believe the answer is:
splendour
'radiance' is the definition.
'plunder so arranged' is the wordplay.
'arranged' indicates an anagram.
'plunder'+'so'='plunderso'
'plunderso' is an anagram of 'SPLENDOUR'.
'shows' acts as a link.
(Other definitions for splendour that I've seen before include "Magnificence, brilliance" , "show" , "Brilliance or pomp" , "Glory, brilliance" , "Sumptuous display - Len's proud (anag)" .)