How many letters does the top answer for “author of the seventh cross” have?

The most common answer is zinnemann (9 letters).

Crossword clue: author of the seventh cross

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

zinnemann 9 letters wd-fact-v3

author of the knights of the cross 50% similar → sienkiewicz

author of the seventh seal 50% similar → bergman

author of the seventh sign 50% similar → busia

wrote the seventh cross 50% similar → zinnemann