Dismissing for plundering (7)
I believe the answer is:
sacking
This clue is a double definition.
'dismissing' is the first definition.
('sack' can be a synonym of 'dismiss')
'for plundering' is the second definition.
('sack' can be a synonym of 'plunder')
(Other definitions for sacking that I've seen before include "Terminating someone's employment" , "Looting - coarse cloth - dismissal" , "Coarse stuff" , "Terminating a person's employment" , "devastating" .)