Peacekeepers getting started, spreading out (9)

I believe the answer is:

unrolling

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'spreading out' is the definition.
The answer and definition can be both to do with contact as well as being present participle verbs.
Perhaps you can see an association between them that I can't see?

'peacekeepers getting started' is the wordplay.
'peacekeepers' becomes 'UN' (United Nations, peacekeeping organisation).
'getting started' becomes 'rolling' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'un'+'rolling'='UNROLLING'

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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