### Clue: Strong hand, flat chest (6)
### Answer: ROBUST 
 ### Explanation: Definition: Strong
 R(abbrev. for the "right" hand) + [O BUST](zero/no bust;flat chest – although an O cup bust would be far from flat and quite uncomfortable, I can only imagine).
Is the clue the female counterpart to the conventional belief "Big hands, big ….. (mentioned elsewhere in the puzzle)". It would seem Michelangelo had it wrong. But probably not, as scientific data indicates. On the other hand(!), the length of the index finger … that is a different matter.