Pen name derived from Moses "with a head cold" (3)

I believe the answer is:

boz

(Other definitions for boz that I've seen before include "Dickens's pseudonym" , "Sketch writer" , "Sketches by - (Dickens)" , "Pseudonym of Charles Dickens" , "Dickens's pen name" .)

I've seen this clue in the Newsday.

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