I give up - can't get the last three. Any help gratefully accepted!
17d Everything is about heaven-bound clergyman in melody, save the introduction (8)
u-i-e---
20d Plant I fed to rodent, ending in cat (6)
v-o---
24a/22d What one should put on English ship, fish among red nuts (5,4)
----- c---
Did think perhaps violet and universe for first two but can't see why.