Crossword Genius

Bed not turned - but the sheets may be (6)

Ross

I believe the answer is:

cotton

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

'the sheets may be' is the definition.
I can't tell whether this definition defines the answer.

'bed not turned' is the wordplay.
'bed' becomes 'cot' (cot is a kind of bed).
'turned' says the letters should be written in reverse.
'not' backwards is 'ton'.
'cot'+'ton'='COTTON'

'but' acts as a link.

Can you help me to learn more?

(Other definitions for cotton that I've seen before include "Substance like fine wool" , "Cloth woven from a plant" , "Golfing man" , "Soft fabric and fluffy wool (6" , "Fabric woven from plant fibres" .)

I've seen this clue in The Globe and Mail and The Guardian.
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