How many letters does the top answer for “which of these mythological creatures is said to be half-man and half-horse” have?

The most common answer is centaur (7 letters).

Crossword clue: which of these mythological creatures is said to be half-man and half-horse

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

centaur 7 letters otdb

a conspicuous constellation in the southern hemisphere near the Southern Cross