A bit harsh S!
11a is one of the clues with a letter missing in the definition. The first word + the missind letter is the defn.
Then you need a word for a screen ( less 2 letters meaning very big) with a(article) inside
34a Way out of university (5) CO?S?. Can't think what this could be, unless I've gone wrong.
37d Be against beer (4) ?AL?. Is this one of the two without definition?
Pointers appreciated.