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I think senility is setting in, or maybe it's the heat. I have two answers that fit, but I still don't get half the clue. Could somebody explain please?
6D University intake about to get child's ailment. ?R?U? It must be croup, but why?
24A Musician lacks veto for domestic support. ?O?S?. It must be joist, but why?
Thanks.

24a (ban) joist

6d: croup = child's ailment (def)
crop - intake
u - university

Thank you both. I really need to get out more.

You are very welcome, Bees!