Dickensian pseudonym (3)
I believe the answer is:
boz
'dickensian pseudonym' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for boz that I've seen before include "Sketches by - (Dickens)" , "Dickens's pen name" , "Dickens's pseudonym" , "Pseudonym of Charles Dickens" , "Sketch writer" .)