### Clue: Book by lecturer, mischievous reactionary (8)
### Answer: BLIMPISH 
 ### Explanation: Definition: reactionary
 B(abbrev. for "book") **plus**(by) L(abbrev. for "lecturer") + IMPISH(mischievous like an imp).
Answer: After Colonel Blimp, the British cartoon character depicting a person, especially a military officer, who is stupidly complacent and reactionary.