What do the first six phrases below have in common? The final clue is a hint.

1. Honey mustard

2. Snow White

3. Scarlet fever

4. Proud as a peacock

5. Green energy

6. Sugar plum fairy

7. Line in "Casablanca" 

Answer to clue 7:

"Round up the usual suspects."

 

Answers to clues 1-6:

Each phrase contains the name of one of the original suspects in the game CLUE:

 

1. Colonel Mustard

2. Mrs. White

3. Miss Scarlet

4. Mrs. Peacock

5. Mr. Green

6. Professor Plum