How many letters does the top answer for “a malayan dagger with a wavy blade” have?

The most common answer is crease (6 letters).

Crossword clue: a malayan dagger with a wavy blade

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

crease 6 letters wn-def

make wrinkles or creases on a smooth surface; make a pressed, folded or wrinkled line in; `crisp' is archaic

creese 6 letters wn-def

a Malayan dagger with a wavy blade

kris 4 letters wn-def

a Malayan dagger with a wavy blade