Possible Clues:

• Down in the mouth, depressed
• Not happy to get sticky in the mouth about fifty
• 'Why so ___?'
• Moody learner into something sticky
• Fifty boards to stick down
• Joyous? Oh no, no, no
• Grand purplish colour, not soft blue
• Sad face reflected jealous heart inside
• Stick with left internally disheartened
• Downhearted atomic company, American, kicked out of 9