Crossword Genius

It's silly making a lot of noise when the light goes out (5)

Ross

I believe the answer is:

daffy

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'it's silly' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for daffy that I've seen before include "Bonkers" , "Cuckoo" , "Silly, mildly eccentric" , "Crazy" , "Silly, eccentric (colloq.)" .)

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