Related Clues:

• Core of a computer's operating system
• Inner part of nut
• Core of a nut
• Edible part of nut
• Hard centre of nut
• Edible part of a nut
• The edible centre of a nut
• Inner part of a seed or grain
• Edible or central part of nut
• The inner part of a nut
• Centre parts of nuts
• Inner part of a seed
• How rank it sounds, right in the middle
• Does it sound so rank at the heart of things?
• What a rank-sounding way to be at the centre of things!