12: One member of English rock group, one going on record _E_D_E
30: More refined Conservative right to block maverick _O_U_L_E_
However, the "U" in 30 depends on the solution to 25 down being STYLUS. The clue is Writer's special name for rock once. I cannot parse it, but stylus fits, and works with the Writer part of the clue.
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