I make city attempt form of worship (8)
I believe the answer is:
idolatry
'form of worship' is the definition.
(I know that Idolatry is a type of worship)
'i make city attempt' is the wordplay.
'make' becomes 'do' (do can mean to make or prepare).
'city' becomes 'LA' (Los Angeles).
'attempt' becomes 'try' (synonyms).
'i'+'do'+'la'+'try'='IDOLATRY'
(Other definitions for idolatry that I've seen before include "Worship of godly images" , "Excessive devotion" , "Graven image worship" , "Worship of carved images" , "Icon worship" .)