8a The number that is concealed by God ???? (no letters)
10a Re-elect Elton? how ghastly! (What will it do to the place?) ????? THE ?O?E
20a so, is it blue or is it green? Some might fancy another colour. ???N
21a Would you hear it's tough as this T?A?
1d A hell of a thing to be into - O my God end Lucifer's corruption ?????O?O??
1 this does not work as an anagram of "O my God end l", that would give two "d"s and only one "d" in the answer. It's the way I assumed it to be until I rechecked.