Having restricted Southern girl, face sack (9)
I believe the answer is:
dismissal
'sack' is the definition.
(sacking is dismissal from one's job)
'having restricted southern girl face' is the wordplay.
'having restricted' indicates putting letters inside.
'southern' becomes 's' (abbreviation).
'girl' becomes 'miss' (term of address for an unmarried woman).
'face' becomes 'dial' (face of a clock).
's'+'miss'='smiss'
'smiss' placed inside 'dial' is 'DISMISSAL'.
(Other definitions for dismissal that I've seen before include "Discharge" , "getting cards?" , "job loss?" , "ending" , "Process of being sent away" .)