Possible Clues:

• Smaller than small
• Payment to a man in charge is very small
• On a very tiny scale
• Transport review by A. Tomas gets one complaint initially - it's a minuscule one
• Of smaller than elementary particles
• Incredibly small club in Finish cape
• Very tiny coat - bum is suffering!
• Like a quark
• Like quarks
• Smaller than a basic particle of matter