### Clue: Byline pictures prison riots (14)
### Answer: SUPERSCRIPTION 
 ### Explanation: Definition: Byline
  **Anagram of**(riots) PICTURES PRISON
Answer:  A superscription is something that is written above some writing, and most commonly like so1.  A byline is the line above, say, a newspaper article, on which is written/printed the author's name.  One could stretch the meanings to be synonymous, I guess.