How many letters does the top answer for “be at an angle” have?

The most common answer is slope (5 letters).

Crossword clue: be at an angle

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

slope 5 letters wn-def

an elevated geological formation

an angle of 360 degrees 50% similar → perigon

at an oblique angle 50% similar → aslant, athwart, obliquely

(of movement) at an angle 50% similar → crabwise, sideways