Grandma, as a little girl (3)
I believe the answer is:
nan
This clue is a double definition.
'grandma' is the first definition.
(nan can informally mean a grandmother)
'a little girl' is the second definition.
(Nan can be short for Nancy or Anne)
'as' acts as a link.
(Other definitions for nan that I've seen before include "Grandmother (colloq.)" , "Grannie" , "Relation" , "Indian bread - older relative" , "Gran" .)