May go back to school for some food (4)

I believe the answer is:

yams

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'for some food' is the definition.
I can't judge whether this definition defines the answer.

'may go back to school' is the wordplay.
'go back' is a reversal indicator.
'to school' becomes 'S'.
'may' in reverse letter order is 'yam'.
'yam'+'s'='YAMS'

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(Other definitions for yams that I've seen before include "Sweet potatoes" , "Roots" , "Edible tubers from the tropics" , "vegetables" .)

I've seen this clue in The Mirror.

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