The woman will dismiss flak, perhaps (9)
I believe the answer is:
shellfire
'flak perhaps' is the definition.
'the woman will dismiss' is the wordplay.
'the woman will' becomes 'shell'.
'dismiss' becomes 'fire' ('fire' can be a synonym of 'dismiss').
'shell'+'fire'='SHELLFIRE'
(Other definitions for shellfire that I've seen before include "Barrage" , "an experience of war" , "use of artillery" , "What generates multiple reports" , "Bombardment from heavy artillery" .)