Possible Clues:

• Asian long-distance runner has audition for commercial
• Like some business involving River Test?
• River Test plants may be so described
• Where some mites taking refuge set up business
• Characterised by manufacturing processes
• About the makings of a court case under the river?
• Like manufacturing at home remains with Middle Eastern money
• Tough there's a court case to do with the flower
• Having many factories on River Test
• Business proceedings under Asian runner