Do weeding, and risk getting stung (5,3,6)
I believe the answer is:
grasp the nettle
I'm afraid I can't even guess how this answer relates to the clue.
Can you help me to learn more?
(Other definitions for grasp the nettle that I've seen before include "likelihood of stingy response?" , "Tackle a difficulty boldly" , "Act boldly" , "taking stingy type in hand" , "do some weeding?" .)