Related Clues:

• 1967 Robert Knight hit
• Durable piece of boxin' equipment?
• Hit for Robert Knight or U2
• Romantic hit song that just keeps going?
• 1978 Andy Gibb hit (with ''An'')
• *1974 Carl Carlton hit
• Newlyweds' mutual pledge
• Gloria Estefan's never-ending romance
• Winter item you'll be wearin' for years?