The Clue "For ____ a jolly good fellow..."
The Answer HES
The answer "HES" fits the clue because it completes the famous song lyric "For he's a jolly good fellow." This phrase is often sung to celebrate someone, especially at parties or gatherings. The word "he's" is a contraction of "he is," which matches the clue perfectly. Overall, "HES" is a clever way to represent the song's joyful sentiment.