... for nuts it's silly eating seconds (6)

I believe the answer is:

insane

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'for nuts' is the definition.
('insane' can be similar in meaning to 'nuts')

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for insane that I've seen before include "Demented" , "Anne is (anag) - crazy" , "Harebrained" , "Eg, gun or knife" , "off trolley" .)

I've seen this clue in The Telegraph.

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