Crossword Genius

Sleep with relations under a cloth (6)

Ross

I believe the answer is:

napkin

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

'a cloth' is the definition.
(I've seen this before)

'sleep with relations under' is the wordplay.
'sleep with' becomes 'nap' (a nap is a short sleep. I am not sure about the 'with' bit.).
'relations' becomes 'kin' (I've seen this before).
'under' means one lot of letters go next to another.
'nap'+'kin'='NAPKIN'

Can you help me to learn more?

(Other definitions for napkin that I've seen before include "Protective cloth square worn during meals" , "Cloth rectangle worn at mealtime" , "Serviette; diaper" , "Small piece of table linen" , "Cloth square used to protect clothing while eating" .)

I've seen this clue in The Guardian.
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