How many letters does the top answer for “a bell tower; usually stands alone unattached to a building” have?

The most common answer is belfry (6 letters).

Crossword clue: a bell tower; usually stands alone unattached to a building

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

belfry 6 letters wn-def

a bell tower; usually stands alone unattached to a building

campanile 9 letters wn-def

a bell tower; usually stands alone unattached to a building