Hugely enjoying a party circuit (7)
I believe the answer is:
adoring
'hugely enjoying' is the definition.
(adore can mean to love or enjoy greatly)
'a party circuit' is the wordplay.
'party' becomes 'do' (do is a kind of party).
'circuit' becomes 'ring' (I've seen this in other clues).
'a'+'do'+'ring'='ADORING'
(Other definitions for adoring that I've seen before include "Loving deeply" , "Passionate" , "Loving, worshipping" , "Greatly loving" , "Extravagantly indulgent" .)