Ten IBAC reviews for ministers (7)
I believe the answer is:
cabinet
'for ministers' is the definition.
(government ministers)
'ten ibac reviews' is the wordplay.
'reviews' says the letters should be written in reverse (I've seen 'review' mean this).
'ten'+'ibac'='tenibac'
'tenibac' back-to-front is 'CABINET'.
(Other definitions for cabinet that I've seen before include "bed" , "It may be shelved" , "elected ministers" , "Cupboard; committee" , "Committee of senior ministers" .)