Basic foods keep (5-3-6)
I believe the answer is:
bread-and-butter
This might be a double definition.
'basic' is the first definition.
(I've seen this before)
'foods keep' is the second definition.
'bread and butter' can be an answer for 'keep' (synonyms). I am not certain of the 'foods' bit.
Can you help me to learn more?
(Other definitions for bread-and-butter that I've seen before include "Living" , "livelihood" , "standard" , "Materialistic, practical" , "Basic" .)