A party, lot making love (9)
I believe the answer is:
adoration
'love' is the definition.
(to adore someone is to love them)
'a party lot' is the wordplay.
'party' becomes 'do' (do can informally mean a party).
'lot' becomes 'ration' (lot can mean a ration or allocation).
'a'+'do'+'ration'='ADORATION'
'making' is the link.
(Other definitions for adoration that I've seen before include "Great affection" , "enormous respect" , "Not a radio (anag.)" , "passionate allegiance" , "Hero-worship" .)