Very fond of a social call (7)
I believe the answer is:
adoring
'very fond' is the definition.
'a social call' is the wordplay.
'social' becomes 'do' (both can mean a party).
'call' becomes 'ring' (synonyms).
'a'+'do'+'ring'='ADORING'
'of' acts as a link.
(Other definitions for adoring that I've seen before include "Loving deeply" , "Worshipful" , "Worshipping the loved one" , "Giving great love" , "Greatly loving" .)