Snack and wine consumed by one on foot (7)
I believe the answer is:
toastie
'snack' is the definition.
(I've seen this before)
'wine consumed by one on foot' is the wordplay.
'wine' becomes 'asti' (I've seen this before).
'consumed by' means one lot of letters goes inside another.
'one on foot' becomes 'toe' (I can't explain this - if you can you should give a lot more credence to this answer).
'asti' inserted into 'toe' is 'TOASTIE'.
'and' is the link.
Can you help me to learn more?
(Other definitions for toastie that I've seen before include "Hot snack (informal)" , "Hot sandwich" , "Toasted sandwich" , "Grilled sandwich" , "Type of sandwich" .)