How many letters does the top answer for “wrote lulu” have?

The most common answer is berg (4 letters).

Crossword clue: wrote lulu

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

berg 4 letters wd-fact-v3

a large mass of ice floating at sea; usually broken off of a polar glacier

wrote 1q84 50% similar → murakami

wrote 2666 50% similar → bolano

wrote 4 3 2 1 50% similar → auster

wrote q11368 50% similar → kernighan, ritchie

wrote q13415681 50% similar → hamill

wrote q134773 50% similar → zemeckis

wrote q1457000 50% similar → knuth

wrote q16276 50% similar → roddenberry