How many letters does the top answer for “emptying something accomplished by allowing liquid to run out of it” have?

The most common answer is drain (5 letters).

Crossword clue: emptying something accomplished by allowing liquid to run out of it

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

drain 5 letters wn-def

flow off gradually

drainage 8 letters wn-def

emptying something accomplished by allowing liquid to run out of it