How many letters does the top answer for “come up with (an idea, plan, explanation, theory, or principle) after a mental effort” have?

The most common answer is contrive (8 letters).

Crossword clue: come up with (an idea, plan, explanation, theory, or principle) after a mental effort

contrive, devise, forge, invent.

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

contrive 8 letters wn-def

come up with (an idea, plan, explanation, theory, or principle) after a mental effort

devise 6 letters wn-def

come up with (an idea, plan, explanation, theory, or principle) after a mental effort

forge 5 letters wn-def

come up with (an idea, plan, explanation, theory, or principle) after a mental effort

invent 6 letters wn-def

come up with (an idea, plan, explanation, theory, or principle) after a mental effort