Crossword Genius

It's growing in freedom, in bed (4)

Ross

I believe the answer is:

reed

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

'it's growing in freedom' is the wordplay.
'REED' is hidden in amongst the letters.
But, I'm not sure how the hidden word is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for reed that I've seen before include "Marsh plant with tall straight stem" , "Clarinet part; plant" , "Tall grass that grows in swamps" , "Grassy plant of wet areas" , "Grass of marshy land" .)

I've seen this clue in the Evening Standard.
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