Don't know letter numbers, and they probably don't parse as such . .
All are names of birds . .
1.When high spend lots
2. The failed twitcher
3. Note that going for a walk reveals winter visitor
4. Caution to wait
5. Negation
6. Equipment of the orient
7. Not too affected by mosquito attack
8. Trumped
9. Ring the bell insistently
10. Hairless top fish