Crossword Genius

Infantrymen guided arrangers in orchestration (9,6)

Ross

I believe the answer is:

grenadier guards

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

'infantrymen guided arrangers in orchestration' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'infantrymen guided arrangers in orchestration' is the wordplay.
'guided arrangers' anagrams to 'GRENADIER GUARDS'.
Though, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Another definition for grenadier guards that I've seen is " Soldiers".)

I've seen this clue in The Everyman puzzle in The Observer.
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