I was so surprised when I checked AnsweBank today for answers to the above, either you are all clever clogs and worked it out yourself or you are still working out 49 & 50. Whatever he are a few more for you, if you please.
11a "Old collectables turned into caviar" (10) third letter 'C'
22a "Rent yard out thirty days for sitcom" (5,3,4) ?e???/a??/?u??
18a "Blokes giggling is a crime" (12) m?n???????e?
7d "Meat I land up cooking for northener" (12) L?????u???a?