Relative's Indian side dish (3)
I believe the answer is:
nan
I believe this clue is a double definition.
'relative's' is the first definition.
(informal term for a grandmother)
'indian side dish' is the second definition.
(naan bread)
(Other definitions for nan that I've seen before include "woman from an earlier generation" , "Indian bread; grandma" , "Indian bread - older relative" , "Granny; bread" , "Ancestor" .)