Biscuit barrel upside-down below item on spice rack? (6,3)
I believe the answer is:
ginger nut
'biscuit' is the definition.
(I've seen this before)
'barrel upside-down below item on spice rack?' is the wordplay.
'barrel' becomes 'tun' (tun is a kind of barrel).
'upside down' says the letters should be written backwards.
'below' means one lot of letters go next to another.
'item on spice rack?' becomes 'ginger'.
'tun' written backwards gives 'nut'.
'nut' put after 'ginger' is 'GINGER NUT'.
(Other definitions for ginger nut that I've seen before include "Type of biscuit" , "redhead?" , "Variety of biscuit" , "Spicy biscuit" , "Kind of biscuit" .)