Tries rearranging rituals (5)
I believe the answer is:
rites
'rituals' is the definition.
(I know this)
'tries rearranging' is the wordplay.
'rearranging' is an anagram indicator (I've seen 'rearranged' mean this).
'tries' anagrammed gives 'RITES'.
(Other definitions for rites that I've seen before include "formal procedure" , "Rituals" , "Ceremonial forms" , "Customary observances, religious say" , "offices" .)