How many letters does the top answer for “an embellishing note usually written in smaller size” have?

The most common answer is acciaccatura (12 letters).

Crossword clue: an embellishing note usually written in smaller size

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

acciaccatura 12 letters wn-def

an embellishing note usually written in smaller size

appoggiatura 12 letters wn-def

an embellishing note usually written in smaller size