52. Three letters used to express when you are expected to be somewhere in the middle of which are the roman numerals for six. Answer is the name of a well-known show, no longer in the west end.
65. The word used to describe theatrical make-up. When you get the answer, you will see how it is compiled.
67. Anagram of second word, the idle refers to Eric Idle. How an item in an auction is referred to
89. Name of a show from the sixties I think with people like Peter Cook. The title answers each part of the clue if that makes sense.