Noisy mistake? (7)

I believe the answer is:

clanger

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'mistake?' is the definition.
(clanger is a kind of mistake)

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

(Other definitions for clanger that I've seen before include "Bell possibly" , "dropped by accident?" , "Drop this to make a blunder" , "Stupid mistake" , "Howler" .)

I've seen this clue in The Sun.

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