Indians supply this aged family member (3)
I believe the answer is:
nan
'indians supply this aged family member' is the definition.
The definition suggests a singular noun which matches the answer.
This is all the clue.
Can you help me to learn more?
(Other definitions for nan that I've seen before include "Indian bread - older relative" , "Elderly relative" , "Gran" , "A relative (colloq.); unleavened bread" , "Grannie" .)