The band Clock features P.J. Smith and a man that replaced what Def Leppard member?
Clock (band): Clock is a band featuring Def Leppard guitarist Vivian Campbell and P.J. Smith, who sang backing vocals on Def Leppard's cover of the Sweet song "Action" on Def Leppard's "Retro Active" (1993) album. Vivian Campbell:  He came to prominence in the early 1980s as a member of Dio, and has been a member of Def Leppard since 1992 (replacing Steve Clark).
Steve Clark