Crossword Genius

Cuckoo touched nuts and crackers (7)

Ross

I think it could be either:

lunatic

cracked
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'cuckoo' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for lunatic that I've seen before include "Type of fringe" , "Maniac" , "Madman - idiot" , "bonkers" , "Foolish person" .)

I've seen this clue in The Telegraph.
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