The Clue Genius, as a MG Mini speed-solver
The Answer WHIZ
The word "whiz" means a person who is very skilled or talented in a particular area, often referred to as a genius. In the context of a "speed-solver," it suggests someone who can solve puzzles quickly and efficiently. The MG Mini is a small, fast car, which connects to the idea of speed. Therefore, "whiz" perfectly fits the clue as it describes both a talented individual and the quickness associated with solving puzzles.