Crossword Genius

Could it be fun to sleep on? (5)

Ross

I believe the answer is:

futon

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'sleep on?' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'could it be fun to' is the wordplay.
'could it be' indicates an anagram.
'fun'+'to'='funto'
'funto' anagrammed gives 'FUTON'.

Can you help me to learn more?

(Other definitions for futon that I've seen before include "A Japanese bed-mattress" , "Foldable mattress" , "Japanese sofa bed" , "Kind of Japanese bed convertible to couch" , "Kind of Japanese chair-bed" .)

I've seen this clue in the Evening Standard.
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