Related Clues:

• Poor writer's scribblings?
• Evidence of debt
• Debt acknowledgements
• Chits in the pot
• Chits acknowledging debt
• Ship haven or shelter
• Tie up the shipping here
• Sheltered port
• There's water in it and trees in the end of it
• A small port might do for this
• There's a bar there and a bar hidden in 15 across
• Might have a bar where there's port
• 'They show people are indebted to UUUUUUUUUU, it seems (4)'
• 'They give promise of being UUUUUUUUUU, perhaps (4)'
• Markers of a sort