Adroitly modified excessive adoration (8)
I believe the answer is:
idolatry
'excessive adoration' is the definition.
(I've seen this before)
'adroitly modified' is the wordplay.
'modified' is an anagram indicator.
'adroitly' anagrammed gives 'IDOLATRY'.
(Other definitions for idolatry that I've seen before include "reverence" , "Worship of carved images" , "Worship of godly images" , "Icon worship" , "bowing down before a goddess?" .)