Possible Clues:

• Citrus peel used as flavoring
• Enthusiasm shown by last letter oddly missing from bedsit
• Marmalade component
• Jazz age was best, conclusively, for enthusiasm
• Lemon bar ingredient
• Enthusiasm stifled by size, strangely
• Key lime pie garnish
• Ingredient in marmalade
• Bits in citrus sorbet
• Tart shavings