How many letters does the top answer for “armor plate that protects legs below the knee” have?

The most common answer is greave (6 letters).

Crossword clue: armor plate that protects legs below the knee

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

greave 6 letters wn-def

armor plate that protects legs below the knee

jambeau 7 letters wn-def

armor plate that protects legs below the knee