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

The most common answer is leary (5 letters).

Crossword clue: director of ice age

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

leary 5 letters wd-fact-v3

United States psychologist who experimented with psychoactive drugs (including LSD) and became a well-known advocate of

romano 6 letters wd-fact-v3

director of ice age: continental drift 60% similar → wilson

author of ice age 50% similar → romano

composer of ice age 50% similar → leary

wrote ice age 50% similar → romano