Sudden attacks securing Australian policy change (9)

I believe the answer is:
turnabout
'change' is the definition.
(turnabout is a kind of change)
'sudden attacks securing australian policy' is the wordplay.
I cannot really understand how this works, but
'australian' could be 'abo' (Abo is an example) and 'abo' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for turnabout that I've seen before include "Total change of policy" , "complete change of policy" , "That makes a change" , "change of heart" .)
