One adores following after single party (8)
I believe the answer is:
idolater
'one adores' is the definition.
(someone who worships idols)
'following after single party' is the wordplay.
'following' becomes 'later' (I've seen this in other clues).
'after' says to put letters next to each other.
'single' becomes 'I' (one).
'party' becomes 'do' (do is a kind of party).
'i'+'do'='ido'
'later' after 'ido' is 'IDOLATER'.
(Other definitions for idolater that I've seen before include "I love a religious image" , "No orthodox believer" , "A person who worships idols" , "Tailored to worshipper of graven images" , "great admirer" .)