How many letters does the top answer for “a spot; a blemish; a mole. spenser.” have?

The most common answer is mold (4 letters).

Crossword clue: a spot; a blemish; a mole. spenser.

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

mold 4 letters web-def

form in clay, wax, etc