How many letters does the top answer for “a drip, when made of stone. see drip, 2.” have?

The most common answer is dripstone (9 letters).

Crossword clue: a drip, when made of stone. see drip, 2.

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

dripstone 9 letters web-def

a protective drip that is made of stone

a protective drip that is made of stone 50% similar → dripstone