Could it sting you in bed? (6)

I believe the answer is:

nettle

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'sting you in bed?' is the definition.
'nettle' can be an answer for 'sting' (I've seen this before). I'm not certain of the 'you in bed?' bit.

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

Can you help me to learn more?

(Other definitions for nettle that I've seen before include "Stinging weed - pester" , "Irritate, annoy" , "it seems to flower only if dead" , "Stinging plant; annoy" , "urticaceous plant" .)

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