26. Oriental coppers (as in coins) are SEN around E (key)
12. I think the first reference is to the 50s play of that name which could loosely be described as a passion play. The place is associated with passion plays in the religious sense.
ob is a river (banker in crosswordese) in russia
un do could be " a party" in france. drop the capital R in ravel. not a great clue
a shoe is worn at ones base, so an overshoe is a basic topping
11 ? is there a breed of sheep with letters removed?