How many letters does the top answer for “a person or organization that causes pollution of the environment” have?

The most common answer is defiler (7 letters).

Crossword clue: a person or organization that causes pollution of the environment

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

defiler 7 letters wn-def

a person or organization that causes pollution of the environment

polluter 8 letters wn-def

a person or organization that causes pollution of the environment