Below are possible answers for the crossword clue Blue book filler.
a tentative attempt
an analytic or interpretive literary composition
prototype of a proposed postage stamp
make an effort or attempt; "He tried to shake off his fears"; "The infant had essayed a few wobbly steps"; "The police attempted to stop the thief"; "He sought to improve himself"; "She always seeks to do good in the world"
put to the test, as for its quality, or give experimental use to; "This approach has been tried with good results"; "Test this recipe"
a set of questions or exercises evaluating skill or knowledge; "when the test was stolen the professor had to make a new set of questions"
someone who is tested (as by an intelligence test or an academic examination)
Other crossword clues with similar answers to 'Blue book filler'