I have the answer to these but there's a bit of the wordplay in both that I can't quite see.
Each clue has an extra letter.
17d - Secret oriental festival repeatedly stopped by upset European (9)
the answer is a French term meaning secret. I can see the "oriental festival repeated" and possibly "stopped by" 2 single letter "Europeans" after each but that leaves a single letter in the middle that I can't parse so I presume it goes with the extra letter as the 2 together can mean "by" but why "upset" - it's the middle so does it matter?
14a - Ordeal affected name of man’s famous ruler (5)
The answer is a "name of man" but why "famous ruler"? I've Googled the answer followed by his name but get absolutely nothing. I've even looked at a long list of other people with the same name but again, nothing.