Deal tiro organised for worshipper of false god (8)
I believe the answer is:
idolater
'worshipper of false god' is the definition.
'deal tiro organised' is the wordplay.
'organised' indicates anagramming the letters.
'deal'+'tiro'='dealtiro'
'dealtiro' with letters rearranged gives 'IDOLATER'.
'for' acts as a link.
(Other definitions for idolater that I've seen before include "One who worships a false god or graven image" , "Heathen" , "Strong admirer" , "Person who worships graven images" , "great admirer" .)