Rest and food for babies (7)
I believe the answer is:
nappies
'babies' is the definition.
Although both the answer and definition are plural nouns, I cannot see how one could define the other.
'rest and food' is the wordplay.
'rest' becomes 'nap' (I can't explain this - if you can you should give a lot more credence to this answer).
'and' is a charade indicator (letters next to each other).
'food' becomes 'pies' (I've seen this before).
'nap'+'pies'='NAPPIES'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for nappies that I've seen before include "Covers" , "Baby's pads" , "What Americans call diapers" , "Cloths for babies" , "They keep babies dry" .)