Is she a grandmother? (3)
I believe the answer is:
nan
This clue is a double definition.
'is she' is the first definition.
'a grandmother?' is the second definition.
(I've seen this before)
(Other definitions for nan that I've seen before include "Indian bread - older relative" , "woman from an earlier generation" , "Darling dog" , "type of slightly leavened bread" , "Elderly relative" .)