How many letters does the top answer for “a baseball deliberately thrown at the batter's head” have?

The most common answer is beanball (8 letters).

Crossword clue: a baseball deliberately thrown at the batter's head

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

beanball 8 letters wn-def

a baseball deliberately thrown at the batter's head

beaner 6 letters wn-def

a baseball deliberately thrown at the batter's head