How many letters does the top answer for “choose and follow; as of theories, ideas, policies, strategies or plans” have?

The most common answer is adopt (5 letters).

Crossword clue: choose and follow; as of theories, ideas, policies, strategies or plans

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

adopt 5 letters wn-def

choose and follow; as of theories, ideas, policies, strategies or plans

espouse 7 letters wn-def

choose and follow; as of theories, ideas, policies, strategies or plans