Woman's religious book in sack (9)
I believe the answer is:
dismissal
'sack' is the definition.
(sacking is dismissal from one's job)
'woman's religious book' is the wordplay.
'woman's' becomes 'di's' (short for Diana).
'religious book' becomes 'missal' (I've seen this before).
'dis'+'missal'='DISMISSAL'
'in' acts as a link.
(Other definitions for dismissal that I've seen before include "brush-off" , "sending off" , "Discharge" , "Termination of employment" , "Sacking; end of innings" .)