9a. Worldly part-timer to take exam (8)
t - m - - - a -
6d. Getting plants established is cheering (7)
r - - - i - g
7d. Muslim leaders (5) - m - m -
19a Melodies (4) - - r - this could be airs?
16d. Bog (5) - - - s - if the one above is airs it gives 'a' as the second letter.
17d. Common-or-garden bird (6) - o - t - r
Any help REALLY appreciated.