Buries arrangement of gems (6)
I believe the answer is:
rubies
'gems' is the definition.
(ruby is a kind of gem)
'buries arrangement' is the wordplay.
'arrangement' indicates an anagram.
'buries' anagrammed gives 'RUBIES'.
'of' acts as a link.
(Other definitions for rubies that I've seen before include "Deep red jewels" , "Deep red gems" , "Red gemstones" , "The Stones in the red" .)