Very fond of a party, call (7)
I believe the answer is:
adoring
'very fond' is the definition.
'a party call' is the wordplay.
'party' becomes 'do' (do is a kind of party).
'call' becomes 'ring' (telephone call).
'a'+'do'+'ring'='ADORING'
'of' acts as a link.
(Other definitions for adoring that I've seen before include "Worshipful" , "Worshipping; admiring" , "Showing great affection" , "Extravagantly indulgent" , "Very keen on" .)