Clue: Still revolutionary keeps a role for US right-wingers (3,5)
Answer: TEA PARTY
Explanation: Definition: US right-wingers
 **Reversal of**(… revolutionary) YET(still/up to present or a specified time, as in "more problems are still to come") **containing**(keeps) [A + PART(a role/a character, in a play or movie, say).
Defn: The political movement of conservatives/right-wingers within the US Republican Party.