Just finished but am perplexed by following. 7d. Educated top Anglicans act out church music = Plainsong ( Please explain clue )
21d. Oz's truck gets stuck in horrible clay = Acutely ( anag of UTE & CLAY ) Where's the clue?
for the second one the compiler missed off the first bit, which was 'seriously' , someone else noted it from same paper some time back, which
hopefully makes more sense.