Crossword Genius

No thanks for festival including loud military instruments (5)

Ross

I believe the answer is:

fifes

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'military instruments' is the definition.
(fife is a kind of flute in military bands)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Another definition for fifes that I've seen is " Small flutes usually with drums".)

I've seen this clue in The Times.
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