How many letters does the top answer for “filling again by supplying what has been used up” have?

The most common answer is refilling (9 letters).

Crossword clue: filling again by supplying what has been used up

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

refilling 9 letters wn-def

filling again by supplying what has been used up

replenishment 13 letters wn-def

filling again by supplying what has been used up