Police officers assigned to princess? (10)

I believe the answer is:

inspectors

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

'police officers' is the definition.
(inspector is a kind of police officer)

'assigned to princess?' is the wordplay.
'to princess' anagrams to 'INSPECTORS'.
But, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Another definition for inspectors that I've seen is " examiners".)

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