Desperate? Access given to most of quantity of food (2-2-3)
I believe the answer is:
do or die
'desperate?' is the definition.
('do or die' can describe a desperate situation)
'access given to most of quantity of food' is the wordplay.
'access' becomes 'door' (door is a kind of access).
'given to' means one lot of letters go next to another.
'most of quantity of food' becomes 'die' (I can't explain this - if you can you should give a lot more credence to this answer).
'door'+'die'='DO-OR-DIE'
Can you help me to learn more?
(Other definitions for do or die that I've seen before include "doggedly determined" , "with dogged determination" , "Stark choice" , "Make a desperate effort whatever the consequences" , "Rash" .)