Possible Clues:

• Bent retainer sees upper class eat fast
• It might have a nut at each end
• Bond half-formed in month before one holds a connection
• Fastener shaped like the 21st letter of the alphabet
• Pipe-support hardware
• Vowel-shaped fastener, or a good user ID for a certain Jamaican sprinter?
• Many a bike lock, essentially
• Former athlete, losing sex appeal, in bar providing security
• *Military vehicles
• Double-headed hardware