British musical rejecting No.1 from Robert Plant (5)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

for the surface, Robert Plant [wiki] is an English singer, part of the band Led Zeppelin OLIVE-[ r ]=the “British musical” [wiki] based on Oliver Twist, with the first letter (No. 1) from R -[obert] removed