Crossword Genius

Sound of my army band? (5)

Ross

I believe the answer is:

corps

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'army band?' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for corps that I've seen before include "Large army group" , "ballet group" , "Branch of an army" , "Body of men" , "Large body of troops" .)

I've seen this clue in The Telegraph.
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