Tries new forms of worship (5)
I believe the answer is:
rites
'forms of worship' is the definition.
'rites' can be an answer for 'forms' (I have seen 'Ceremonial forms ' mean 'rites' so perhaps 'forms' could also mean 'rites'). I'm not certain of the 'of worship' bit.
'tries new' is the wordplay.
'new' indicates anagramming the letters.
'tries' with letters rearranged gives 'RITES'.
Can you help me to learn more?
(Other definitions for rites that I've seen before include "formal procedure" , "Ceremonial observances" , "Customary observances, religious say" , "Ceremonies or services" , "Social customs" .)