Crossword Genius

Making an arrangement, states animosity must change (15)

Ross

I believe the answer is:

systematisation

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

'making an arrangement' is the definition.
I can't judge whether this defines the answer.

'states animosity must change' is the wordplay.
'must change' indicates an anagram (I've seen this in other clues).
'states'+'animosity'='statesanimosity'
'statesanimosity' with letters rearranged gives 'SYSTEMATISATION'.

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I've seen this clue in The Telegraph.
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