The i Cryptic 189

[WyeDyed]

This 'Punk' has got me stumped. I've managed just 1 definite answer and one possible.
24a. Honest post (7) I think it's 'upright' but with no letters and it's letters not helping with the other clues, it doesn't really help.
Can anyone help with these:
14a. Man parting to script novel that's artificial (10) 2nd letter 'R'
16a. Instinct about bad returns for US author (7) ends with 'D'
If I can fathom these, it might just get me going (or not!)

[dxhound2003]

14a Prosthetic, anagram Script To He (man).

[bibblebub]

16a Ellison http://www.theanswerb.../Question1058820.html

[WyeDyed]

Thank you both.
Apologies for repeating questions but my search was too narrow, I looked for '189' instead of 'i cryptic'. Learn, grow, move on.
Cheers