I like to suggest a clan bonus for all the members.
Bonuses are unlocked by trophy rather than levels (since players tend to lower their trophies on purpose)
The idea would be
+1%-? loot bonus
+5-10 army camp space
- 1%-? troop cost
+5%-? attack bonus
And so on. Bonus can be active all the time or just during cw
Bonuses could be unlocked on 5k, 10k, 15k, 20k, etc clan trophy count.
Just giving people something to work for those trophies.