How many letters does the top answer for “the second or lower part of a duet (especially a piano duet)” have?

The most common answer is secondo (7 letters).

Crossword clue: the second or lower part of a duet (especially a piano duet)

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

secondo 7 letters wn-def

the second or lower part of a duet (especially a piano duet)