Sandy seen with fruitcake and biscuit (6,3)
I believe the answer is:
ginger nut
'biscuit' is the definition.
(type of biscuit)
'sandy seen with fruitcake' is the wordplay.
'sandy' becomes 'ginger' (hair colour).
'seen with' says to put letters next to each other.
'fruitcake' becomes 'nut' (I've seen this in another clue).
'ginger'+'nut'='GINGER-NUT'
'and' acts as a link.
(Other definitions for ginger nut that I've seen before include "Kind of biscuit" , "Variety of biscuit" , "Type of biscuit" , "redhead?" , "Spicy biscuit" .)