Palace guards sent man telegram for translation (9,2,4)

I believe the answer is:

gentlemen at arms

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'palace guards sent man telegram for translation' is the definition.
I can't judge whether this defines the answer.

'palace guards sent man telegram for translation' is the wordplay.
'sent man telegram' anagrams to 'GENTLEMEN-AT-ARMS'.
However, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Another definition for gentlemen at arms that I've seen is " bodyguards".)

I've seen this clue in The Daily Mail.

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