Somehow tires of rituals (5)
I believe the answer is:
rites
'rituals' is the definition.
(I know this)
'somehow tires' is the wordplay.
'somehow' is an anagram indicator.
'tires' with letters rearranged gives 'RITES'.
'of' is the link.
(Other definitions for rites that I've seen before include "Ceremonial forms" , "Rituals" , "Formal ceremonial procedures" , "Prescribed religious ceremonies" , "Ceremonies or services" .)