Possible Clues:

• Dim leader of Britain, a tragic figure
• ... dim, initially boring, Shakespearean character
• Make dim, as with tears
• Watery lake in Paddington perhaps
• Blur, as with tears
• Unclear note to get king's support
• Vision problem
• Litre being poured into stomach makes you dim
• Make dim, as overstrained eyes
• Hamper, as vision