Crossword Genius

In bed, perhaps, resented and sent out (4)

Ross

I believe the answer is:

reed

I'm a little stuck... Click here to teach me more about this clue!

'in bed' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for reed that I've seen before include "Clarinet part; plant" , "Tall woody grass" , "Tall water-loving grass" , "Rush" , "Grass of marshy land" .)

I've seen this clue in the Evening Standard.
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