Sat Tel £500 prize x word

[chokkie]

I am absolutely stumped on a few of these, have been going back to it all afternoon and evening, but just can't see the solutions. Would appreciate some help, please.

7a intrude (8) ?r?s?l??
19a pasturing (7) b???ing
79a barley beard (3) a?n
11d procrastinate (5) ????l
12d share or portion (5) s?i?e

Many thanks in advance, Chox.

[sherrardk]

12d - slice?

[chokkie]

oops, there's another one ....
66a calumniate (5) s?e?r

Thanks, Chox

[ladyalex]

66a Smear ?

[Mojo-Jo-Jo]

I think 7 is trespass.
19a grazing
12d slice
79a ear?

[ladyalex]

79a Awn

[chokkie]

I thought 79a was "ear", but am convinced that 67d is "alpha" and 68d is "titan", which makes 79a "a?n".

Hope someone can help, many thanks, chox.

[Mojo-Jo-Jo]

66 smear
11d stall

[chokkie]

Thanks ladyalex - and to everyone else. All done now. Appreciate everyone's help. Chox.

[ladyalex]

Happy to help :-))