Inquisitor 1916: Workout by Poat

There have typically been about 100 puzzles between successive appearances by Poat, but the one prior to this was #1881 Get the Message, last November.
 
Preamble: Four creative works suggest how the answers to each group of clues must be treated. In the fifth group, each clue contains an extra letter which must be removed to enable solving; extras can be arranged to make the creator. The entry at 22dn is two words.

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