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
- Polish official in charge at the end
- Make more elegant
- Polish match official in trouble ultimately
- Clarify, almost cultured
- Make pure, as sugar
- Distill, e.g
- Improve, perfect , fine-tune