Biscuit for dunking in spirit twice? (6,4)
I believe the answer is:
ginger snap
'biscuit' is the definition.
(I know that ginger snap is a type of biscuit)
'spirit twice?' is the wordplay.
'spirit' becomes 'ginger' (ginger is a kind of spirit).
'twice?' becomes 'snap' (I can't justify this - if you can you should give a lot more credence to this answer).
'ginger'+'snap'='GINGER SNAP'
'for dunking in' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for ginger snap that I've seen before include "Spicy biscuit" , "quick bite" .)