How many letters does the top answer for “someone who works to protect the environment from destruction or pollution” have?

The most common answer is conservationist (15 letters).

Crossword clue: someone who works to protect the environment from destruction or pollution

conservationist, environmentalist.

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

conservationist 15 letters wn-def

someone who works to protect the environment from destruction or pollution

environmentalist 16 letters wn-def

someone who works to protect the environment from destruction or pollution