Very late to the party but had lotsa fun nevertheless. Just one clue - 20d - the parsing of which I get, save for one letter. Hints please. Loved all the Paulines (but then who wouldn't?)
I thought 20d was, so to speak, a combination of &Lit and double definition, my first letter corresponds to the 4th word of clue. But I don't use the app so can't confirm.