Crossword Genius

Dangerous as a bear for example (5)

Ross

I believe the answer is:

hairy

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'dangerous' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for hairy that I've seen before include "Hirsute - dangerous" , "With locks" , "Like many dogs" , "fraught with danger" , "like Esau" .)

I've seen this clue in The Independent.
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