Tries rearranging rituals (5)
I believe the answer is:
rites
'rituals' is the definition.
('rite' can be a synonym of 'ritual')
'tries rearranging' is the wordplay.
'rearranging' indicates anagramming the letters (I've seen 'rearranged' mean this).
'tries' is an anagram of 'RITES'.
(Other definitions for rites that I've seen before include "formal procedure" , "Rituals" , "Ceremonial forms" , "Customary observances, religious say" , "offices" .)