Sleep with relations under a cloth (6)
I believe the answer is:
napkin
'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" .)