Relative keen to cut off cloth (3)
I believe the answer is:
nan
'relative' is the definition.
(informal term for a grandmother)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for nan that I've seen before include "Indian bread; grandma" , "Darling dog" , "Elderly relative" , "Grannie" , "Grandmother (informal)" .)