How many letters does the top answer for “affecting the mind or mood or other mental processes” have?

The most common answer is psychoactive (12 letters).

Crossword clue: affecting the mind or mood or other mental processes

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

psychoactive 12 letters wn-def

affecting the mind or mood or other mental processes

psychotropic 12 letters wn-def

affecting the mind or mood or other mental processes