Possible Clues:

• Twisted-in metal fastener
• What propels boat south -- oarsmen?
• Fastener tightened by rotating
• Fastener with a ridge
• 'Righty tighty, lefty loosey' subject
• You may drive one in a garage
• Wood or metal fastener
• First in sewing team, one has a thread
• Casual wages of small gang
• Fastener with a twist