How many letters does the top answer for “a twisted filament; a thread. locke.” have?

The most common answer is twire (5 letters).

Crossword clue: a twisted filament; a thread. locke.

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

twire 5 letters web-def

A twisted filament; a thread. [Obs.] Locke.