I am finding this crossword hard this week, so any help with the following clues would be appreciated please.
12A: Of quadrivalent tin ????N (7)
18A: Reducing gas to denser state ???U?????I?N (12)
26A: Dye C?L???A?? (9)
20D: In far from strong way ??I???Y (7)
7D: Increase power B????? (6)
Thanks in advance.