Figure in a duet that can help one to sleep (5)

I believe the answer is:

duvet

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'figure in a duet that can help one to sleep' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I don't see?

'figure in a duet' is the wordplay.
'figure' becomes 'v' (I can't justify this - if you can you should believe this answer much more).
'in' indicates putting letters inside.
'v' placed into 'duet' is 'DUVET'.

Can you help me to learn more?

(Other definitions for duvet that I've seen before include "Eiderdown" , "Warm covering for bed" , "Continental quilt" , "Bed quilt" , "Type of quilt" .)

I've seen this clue in the Evening Standard.

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