How many letters does the top answer for “clean (a ship's bottom) with heat” have?

The most common answer is bream (5 letters).

Crossword clue: clean (a ship's bottom) with heat

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

bream 5 letters wn-def

any of various usually edible freshwater percoid fishes having compressed bodies and shiny scales; especially (but not e

to clean (a ship's bottom); to grave. 60% similar → greave