May return school food (4)
I believe the answer is:
yams
'may return school food' is the definition.
I can't judge whether this defines the answer.
'may return school' is the wordplay.
'return' shows that the letters should be reversed in order.
'school' becomes 'S'.
'may' reversed gives 'yam'.
'yam'+'s'='YAMS'
Can you help me to learn more?
(Other definitions for yams that I've seen before include "Roots" , "vegetables" , "Edible tubers from the tropics" , "Sweet potatoes" .)