How many letters does the top answer for “director of the vow” have?

The most common answer is tatum (5 letters).

Crossword clue: director of the vow

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

tatum 5 letters wd-fact-v3

United States jazz pianist who was almost completely blind; his innovations influenced many other jazz musicians (1910-1

director of 9-1-1 50% similar → bassett

director of 90210 50% similar → grimes

director of her 50% similar → phoenix

director of q13415681 50% similar → hamill

director of q20856802 50% similar → gosling

director of q23685878 50% similar → levi

director of q60102 50% similar → adlon, shalhoub

director of q79784 50% similar → cox