Code word for C (7)

I believe the answer is:

charlie

(Other definitions for charlie that I've seen before include "Cocaine (colloq.), fool (colloq.)" , "Fool; C (radio comms)" , "Comms code C" , "Fool - drug (slang)" , "Chaplinesque man" .)

I've seen this clue in The Mirror, The Times and The Guardian.

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