How many letters does the top answer for “used of old persons or old trees; covered with knobs or knots” have?

The most common answer is gnarled (7 letters).

Crossword clue: used of old persons or old trees; covered with knobs or knots

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

gnarled 7 letters wn-def

used of old persons or old trees; covered with knobs or knots

gnarly 6 letters wn-def

used of old persons or old trees; covered with knobs or knots

knobbed 7 letters wn-def

used of old persons or old trees; covered with knobs or knots