How many letters does the top answer for “to contract; to draw together.” have?

The most common answer is tuck (4 letters).

Crossword clue: to contract; to draw together.

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

tuck 4 letters web-def

fit snugly into

crowd or draw together 50% similar → huddle