Possible Clues:

• The ostentation of fancy tin-openers
• Claim to be retired, existing within post-work allowance?
• In advance, give a sort of force to claim
• A claim or aspiration (to something)
• Pomposity of pensioner worked up about the ending of Brexit
• Claim source of emotional stress is supporting Spurs regularly
• ... before strained situation leads to unjustified claim
• Claim tin-openers had been damaged