Just food, by the sound of it (4)
I believe the answer is:
fair
'just' is the definition.
('fair' is associated in meaning with 'just')
'food by the sound of it' is the wordplay.
'food' becomes 'fare' (fare is a kind of food).
'by the sound of it' shows a homophone (sound like).
'fare' is a homophone of 'FAIR'.
(Other definitions for fair that I've seen before include "clear" , "legitimate" , "Even-handed travelling show?" , "Equitable - market - not bad" , "Unbiased, being light of skin" .)