Answer:

ELLERYQUEEN

AnswerCrossword Clue
ELLERYQUEENFrederic Dannay and Manfred B. Lee, collectively
ELLERYQUEENCard-playing detective?
ELLERYQUEENDetective with a mystery magazine
ELLERYQUEEN"The Roman Hat Mystery" author
ELLERYQUEENAuthor of "The Roman Hat Mystery"
ELLERYQUEENAuthor of "The Hollywood Murders"
ELLERYQUEENDetective aided by his father
ELLERYQUEENFictional detective who's a board member?
ELLERYQUEENWhodunit byline
ELLERYQUEENDannay-Lee pseudonym.
ELLERYQUEENWell-known nom de plume.
ELLERYQUEENFrederic Dannay and Manfred B. Lee
ELLERYQUEENRalph Bellamy role, often
ELLERYQUEENDannay-Lee sleuth
ELLERYQUEENRalph Bellamy film portrayal
ELLERYQUEENRalph Bellamy's master detective role
ELLERYQUEENPseudonym in detective fiction
ELLERYQUEENWriter at the chess match?
ELLERYQUEENDannay-Lee supersleuth
ELLERYQUEENAka Dannay and Lee
ELLERYQUEENRalph Bellamy film role
ELLERYQUEENSnoop of print
ELLERYQUEENDetective who wrote about himself?
ELLERYQUEENPseudonym in detective stories