Possible Clues:

• Adjuster's backlog
• Insurance adjuster's concern
• One asserts that after a century and a half the manuscript is first-rate (6)
• The demands for 150 objects
• A hundred and fifty objects that one says that are yours
• The way to get a hundred and fifty objects out of insurance
• One wants to have a hundred and fifty objects
• Requests or demands as one's own
• 'Asserts, avers (6)'
• Insurance work