How many letters does the top answer for “travel on foot, especially on a walking expedition” have?

The most common answer is tramp (5 letters).

Crossword clue: travel on foot, especially on a walking expedition

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

tramp 5 letters wn-def

travel on foot, especially on a walking expedition

to practice walking; to travel on foot. 50% similar → pedestrianize