When was the last time Clemson played Alabama an what was the score?

The last time Clemson played Alabama was on January 1, 2018, in the Sugar Bowl, which was part of the College Football Playoff. Clemson won the game with a score of 24-6, advancing to the national championship game. This matchup was notable as it marked a rematch of the previous year's national title game, in which Alabama had triumphed.