I1672 Prize Crossword

[Tubbycoates]

Hi all, stuck on loads !
I can guess at some, but I don't see why they are the answers.

23a academic employment available in quantity(7) P???U?E

24a Pine tree's top feasible as measure of weight (4,3) L?N????

2d Downtrodden employee not right to suffer (5,2) C?T?H?T I assume it's Catch it, but why?

4d Apparently filling video with no animation (5) V?P?D Is it Vapid? why?

5d to Sustain high regard while disregarding House is hard (7) N?U?I?H
Is it Nourish ? why?

18d Captives released, not very free from infection (7) A?E????

22d Asian guy, lecturer in America, turning up (5) S????

Thanks all in advance.

[Neveracrossword]

23 Profuse - Prof+Use

[Neveracrossword]

2D. Cratchit was a long-suffering character,in Dickens. Take out the r/right and you get Catch It.

[Tubbycoates]

They are so easy when you explain them.

[Neveracrossword]

4. Vid is short for Video and Ap is short for Apparentl,so Vapid works.

[Neveracrossword]

18 Aseptic,free from infection. Anagram of Captives without the v/very.

[Captain2]

24a Pine = LONG + T-ON (Top of Tree and feasible = on)

https://en.wikipedia.org/wiki/Long_ton

[Neveracrossword]

5 Honour is high regard,drop the Ho for house. Nour+is,in clue, + h/ard. Nourish.