12a. flees by air? -a-e- / ------
15a quartet of mailing clerks may provide the rest ---r / -o-----
22a. made excuses ---n---
1 & 5d. it will give you full power -a-t- / ---n---
2d. main departure -b-
4d. countries may share them between them ---n-----
16d. not the best man -----