I’ve to do different, new worship (8)
I believe the answer is:
devotion
'worship' is the definition.
(devotion is a kind of worship)
'i've to do different new' is the wordplay.
'different' indicates anagramming the letters.
'new' becomes 'n'.
'ive'+'to'+'do'='ivetodo'
'ivetodo' with letters rearranged gives 'devotio'.
'devotio'+'n'='DEVOTION'
(Other definitions for devotion that I've seen before include "Commitment to some purpose, religion say" , "Intense loyalty" , "Religious zeal" , "Dedication" , "Strong emotional attachment - void note (anag)" .)