Crossword Genius

Initiate violence, toilet bag not prepared (2,4,6)

Ross

I believe the answer is:

go into battle

I'm a little stuck... Click here to teach me more about this clue!

'initiate violence' is the definition.

'toilet bag not prepared' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'not' is 'nto' which is present in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Everyman puzzle in The Observer.
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