How many letters does the top answer for “to learn. see lere, to learn.” have?

The most common answer is lear (4 letters).

Crossword clue: to learn. see lere, to learn.

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

lear 4 letters web-def

the hero of William Shakespeare's tragedy who was betrayed and mistreated by two of his scheming daughters

leer 4 letters web-def

look suggestively or obliquely; look or gaze with a sly, immodest, or malign expression