It's scraped out for military policemen (7)

I believe the answer is:

redcaps

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'military policemen' is the definition.
The answer and definition can be both people as well as being plural nouns.
Perhaps you can see an association between them that I can't see?

'it's scraped out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'scraped' with letters rearranged gives 'REDCAPS'.

'for' acts as a link.

Can you help me to learn more?

(Another definition for redcaps that I've seen is " Military police".)

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