Piece of linen from pot rolled over blood (6)
I believe the answer is:
napkin
'piece of linen' is the definition.
'napkin' can be an answer for 'linen' (napkin is a kind of linen). I'm unsure of the 'piece of' bit.
'pot rolled over blood' is the wordplay.
'pot' becomes 'pan' (I've seen this in other clues).
'rolled over' is a reversal indicator.
'blood' becomes 'kin' (both can mean one's family).
'pan' reversed gives 'nap'.
'nap'+'kin'='NAPKIN'
'from' is the link.
Can you help me to learn more?
(Other definitions for napkin that I've seen before include "Cloth square used to protect clothing while eating" , "Small piece of table linen" , "Cloth to stop, eg, gravy" , "Serviette; diaper" , "Cloth for wiping" .)