How many letters does the top answer for “a brass instrument resembling a cornet but with a wider bore” have?

The most common answer is fluegelhorn (11 letters).

Crossword clue: a brass instrument resembling a cornet but with a wider bore

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

fluegelhorn 11 letters wn-def

a brass instrument resembling a cornet but with a wider bore

flugelhorn 10 letters wn-def

a brass instrument resembling a cornet but with a wider bore