Related Clues:

• Cleanse from impurities
• Remove impurities from (eg, metals)
• Remove impurities (from)
• Make purer
• Elaborate penalty given to engineers
• Perfect ramble ends well
• Purify; improve
• Work ore
• Bank in central Ireland and in Northern Ireland gets to reduce it
• Polish official in charge at the end
• Make more elegant
• Polish match official in trouble ultimately
• Clarify, almost cultured
• Simmering rage in part of Ireland?
• Make pure, as sugar