Clue: Working hard in Bermondsey, engaged by sign painter (8)
Answer: LEONARDO
Explanation: Definition: painter
 [ ON(working/in operation, such as an electrical appliance) + 'ARD("hard" as pronounced by one from Bermondsey, London) ] **contained in**(engaged by) LEO(an astrological sign).
Defn: First name of a famous Italian ….