Possible Clues:

• Grub, caterpillar stage
• Caterpillar variety's found inside
• Glowworm, for example
• Juvenile form of insect
• Grub produced in granular varieties
• Grub, originally hot runny stuff, appears about right
• Five in her makes her grubby
• Grub right at the centre of a burning issue
• What a grubby little thing!
• Volcanic outpouring