user: Question: Tell me the fastest lapf or Jim Clark being the winning driver for Prince George
Columns: ['Race', 'Circuit', 'Date', 'Pole position', 'Fastest lap', 'Winning driver', 'Constructor', 'Tyre', 'Report']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['South African Grand Prix', 'Prince George', '1 January', 'Jim Clark', 'Jim Clark', 'Jim Clark', 'Lotus - Climax', 'D', 'Report']
SQL:

assistant: SELECT "Fastest lap" FROM "Table" WHERE "Winning driver" = 'Jim Clark' AND "Circuit" = 'Prince George';