How many letters does the top answer for “earnest or urgent request” have?

The most common answer is appeal (6 letters).

Crossword clue: earnest or urgent request

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

appeal 6 letters wn-def

earnest or urgent request

entreaty 8 letters wn-def

earnest or urgent request

an urgent or peremptory request 50% similar → demand