Sacked – failed to entertain society girl (9)
I believe the answer is:
dismissed
'sacked' is the definition.
('dismiss' can be a synonym of 'sack')
'failed to entertain society girl' is the wordplay.
'failed' becomes 'died' ('die' can be a synonym of 'fail').
'to entertain' indicates putting letters inside.
'society' becomes 's' (common abbreviation in names of organisations).
'girl' becomes 'miss' ('miss' can be a synonym of 'girl'**).
's'+'miss'='smiss'
'died' placed around 'smiss' is 'DISMISSED'.
(Other definitions for dismissed that I've seen before include "Spurned" , "Fired" , "Brushed off or sacked" , "put out of court" .)