### Clue: One showing off pustule, festering inside (7)
### Answer: BOBADIL 
 ### Explanation: Definition: One showing off
**BOIL** ("pustule") with **BAD **("festering") *inside* 
*A bobadil was a showy braggart, after the character Captain Bobadill in Ben Jonson's play *Every Man in His Humour* (1598).