While searching our database we found 1 possible solution for the: Pseudonym under which writer Brian O’Nolan authored comic novels At Swim-Two-Birds and The Third Policeman crossword clue. This crossword clue was last seen on 19 September 2022 The The Mirror Quiz Crossword puzzle. The solution we have for Pseudonym under which writer Brian O’Nolan authored comic novels At Swim-Two-Birds and The Third Policeman has a total of 11 letters.