### Clue: On blacklist, a so-called piece of music, creation of 22 (12)
### Answer: BANDERSNATCH 
 ### Explanation: Definition: creation of 22
 **Homophone of**(… so-called) ["banned"(on a blacklist/barred from being performed, say) + "a"] +SNATCH(a piece/fragment of music).
Defn: … in his "Through the Looking Glass" and "The Hunting of the Snark".