The Panopticon/doctor who magazine issue 486 crossword

well once again we have more unsolvable clues.

4 across - a nurse : ??n?? 6 down - the doctor told the author of this book that he'd read it to prove he was his number one fan : ??i??r????? 17 down - actor who appeared alongside two, or possibly three, doctors (6,5) : ?????p ??d?c

if i can't solve this rubbish, then i don't know how anyone else can, but if any can it would be greatly appreciated.