Fan of Spice Girl's biscuit? (6,3)
I believe the answer is:
ginger nut
This could be a double definition.
'fan of spice girl's' is the first definition.
The definition suggests a singular noun which matches the answer.
'biscuit?' is the second definition.
(I've seen this before)
(Other definitions for ginger nut that I've seen before include "Spicy biscuit" , "Type of biscuit" , "redhead?" , "Kind of biscuit" , "Variety of biscuit" .)