Hi Grum,
48 ceremony = ritual in the clue
22 the reference is to Samuel Barber and his famous work. The answer parses 2 letters (present) + 4 letters (commission)
47 those three letters are a word for study, though the usage is archaic. It crops up in crosswords quite often so worth remembering
52 parses 1 letter from the clue + 4 letters for the road charge