Crossword Genius

Sleep needed by relations - some linen must be provided (6)

Ross

I believe the answer is:

napkin

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'some linen must be provided' is the definition.
I can't tell whether this defines the answer.

'sleep needed by relations' is the wordplay.
'sleep' becomes 'nap' (I've seen this before).
'needed by' says to put letters next to each other.
'relations' becomes 'kin' (I've seen this before).
'nap'+'kin'='NAPKIN'

Can you help me to learn more?

(Other definitions for napkin that I've seen before include "Diner's cloth" , "Serviette; diaper" , "Cloth for wiping" , "piece of material giving consumer protection" , "Cloth square worn while eating" .)

I've seen this clue in The Telegraph.
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