Possible Clues:

• Common tool
• 'Wrench for bridge, perhaps (7)'
• A help or hindrance in the works
• Tool girl used to replace article in box
• Hand tool to grip and turn
• Gripping thing -- works OK until it's inserted!
• Tool one passes across?
• Tool in small bag on bike I removed
• One maybe coming across interference in works?
• A tool for adjusting bridge?