### Clue: Scientist, one mistakenly called a monster, not honest about ego (8)
### Answer: EINSTEIN 
 ### Explanation: Definition: Scientist

(Frank)**ENSTEIN** ("one mistakenly called a monster", *not* FRANK ("honest")) *about* **I** ("ego")
 
*The name Frankenstein is often mistakenly given to the monster created by Dr Frankenstein.