How many letters does the top answer for “one who applies lute.” have?

The most common answer is luter (5 letters).

Crossword clue: one who applies lute.

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

luter 5 letters web-def

chordophone consisting of a plucked instrument having a pear-shaped body, a usually bent neck, and a fretted fingerboard

one who plays on a lute. 50% similar → luter, lutist