Embark on challenge and risk getting stung (5,3,6)

I believe the answer is:

grasp the nettle

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'embark on challenge' is the definition.
(to grasp the nettle is to embrace a challenge)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for grasp the nettle that I've seen before include "do some weeding?" , "deal with problem" , "taking stingy type in hand" , "Tackle a difficulty boldly" , "tackle problem decisively" .)

I've seen this clue in The Telegraph.

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