Possible Clues:

• Organic radical
• In organic chemistry, an ____ group is a vinyl group attached to a methylene bridge, and is named after the Latin for garlic
• Radical's sidekick, rebel, finally
• Team up with Liberal radical
• Ballylickey's resident radical
• Varnish component that gets its name from the Latin for 'garlic'
• -- sulphide, a colourless liquid that smells like garlic and is used as a flavouring