How many letters does the top answer for “wrote dr. phil” have?

The most common answer is mcgraw (6 letters).

Crossword clue: wrote dr. phil

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

mcgraw 6 letters wd-fact-v3

United States baseball player and manager (1873-1934)

author of dr. phil 50% similar → mcgraw

wrote dr. slump 50% similar → toriyama

wrote dr. strangelove 50% similar → kubrick