Great first Clan War. A few things that might help.
1) Sorting - the players in a clan to be attacked appeared in no particular order. It was hard to find specific players. I recommend ording by Level (so you can find a player around your level) or Alpha (so you can find a player you know their name) or by "Kill Value" with the highest Kill Value's at the top.
2) Dead Players - it was kinda frustrating to click on a player and go through several screens only to find they were dead. Is it possible to flag them somehow in the list or put them at the bottom of the list in a "Dead Section".
3) Ending Time - some players were not really sure how long the clan war was to last. It might help to put both the Start and End time on the screen OR a "time left" time such as "4 hours 45 minutes"
I think that's it for now. Great feature you added.