Love helping at a party (9)
I believe the answer is:
adoration
'love' is the definition.
(to adore someone is to love them)
'helping at a party' is the wordplay.
'helping' becomes 'ration' (a ration is a serving or helping).
'at' says to put letters next to each other (I've seen this in other clues).
'party' becomes 'do' (do can informally mean a party).
'a'+'do'='ado'
'ration' put after 'ado' is 'ADORATION'.
(Other definitions for adoration that I've seen before include "high esteem" , "passionate allegiance" , "Feeling of profound love" , "Honour" , "What star gets from fans" .)