One might sting you in bed (6)
I believe the answer is:
nettle
'sting you in bed' is the definition.
'nettle' can be an answer for 'sting' (I've seen this before). I am unsure of the 'you in bed' bit.
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for nettle that I've seen before include "Grasp it firmly and it will not sting" , "Annoy; common weed" , "Plant with stinging hairs" , "Wild plant - annoy" , "anger?" .)