How many letters does the top answer for “to form into a slimy mass.” have?

The most common answer is clot (4 letters).

Crossword clue: to form into a slimy mass.

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

clot 4 letters web-def

a lump of material formed from the content of a liquid