Scary romp organised for group of soldiers (4,5)

I believe the answer is:

army corps

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'group of soldiers' is the definition.
The definition suggests a singular noun which matches the answer.

'scary romp organised' is the wordplay.
'organised' is an anagram indicator.
'scary'+'romp'='scaryromp'
'scaryromp' anagrammed gives 'ARMY CORPS'.

'for' is the link.

Can you help me to learn more?

(Another definition for army corps that I've seen is " Military unit".)

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