### Clue: Wealthy figure, artist, at home with Charles' mother – it entails minimal effort! (2-7)
### Answer: NO-BRAINER 
 ### Explanation: Definition: it entails minimal effort
 NOB(a figure;person of wealth, or high social standing even) + RA(post-nominal letters for a member of the Royal Academy of the Arts;an artist) + IN(at home) **plus**(with) ER(abbrev. for "Elizabeth Regina", Prince Charles' mother).
Defn: …, mental effort, that is.