What may restock food shop excessively (8)
I believe the answer is:
delivery
'what may restock' is the definition.
'food shop excessively' is the wordplay.
'food shop' becomes 'deli' ('deli' can be a synonym of 'food shop').
'excessively' becomes 'very'.
'deli'+'very'='DELIVERY'
(Other definitions for delivery that I've seen before include "Chinaman, perhaps" , "useful service for the housebound" , "Act of giving birth" , "Throw of a cricket ball" , "Rescue" .)