How many letters does the top answer for “(of champagne) moderately dry” have?

The most common answer is sec (3 letters).

Crossword clue: (of champagne) moderately dry

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

sec 3 letters wn-def

1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites

(of champagne) extremely dry 50% similar → brut