How many letters does the top answer for “city in cape breton” have?

The most common answer is sydney (6 letters).

Crossword clue: city in cape breton

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

sydney 6 letters wd-fact-v3

the largest Australian city located in southeastern Australia on the Tasman Sea; state capital of New South Wales; Austr

city in cape verde 50% similar → assomada, covafigueira, espargos