Possible Clues:

• Eg, tulip or lily
• Underground storage organ for some plants
• Source of light to cry over
• It's used in a flash
• Light in a lamp
• Block tubers, cutting rockets - the type that will eventually grow in the garden
• Onion, or what people do when cutting one back
• Incandescent item, maybe
• Source of light coming from Hostelry overlooking university
• Electric lamp