Part of screwdriver against oak door opening, perhaps (5)
I believe the answer is:
vodka
'part of screwdriver' is the definition.
The definition and answer can be both things that one consumes for nourishment as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'against oak door opening perhaps' is the wordplay.
'against' becomes 'v' (abbreviation for 'versus').
'opening' suggests taking the first letters.
'perhaps' indicates anagramming the letters.
The first letter of 'door' is 'd'.
'oak'+'d'='oakd'
'oakd' anagrammed gives 'odka'.
'v'+'odka'='VODKA'
Can you help me to learn more?
(Other definitions for vodka that I've seen before include "Spirit traditionally made from fermented grains or potatoes" , "Russian liquor" , "Russian "little water"" , "Russian alcoholic drink" , "Originally Russian spirit" .)