Crossword Genius

When food is to be dished out in jail (7,4)

Ross

I believe the answer is:

serving time

I'm a little stuck... Click here to teach me more about this clue!

'jail' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'when food is to be dished out in' is the wordplay.
I cannot quite understand how this works, but
'when' could be 'e' (I've seen this in other clues) and 'e' is present in the answer.
'food' could be 'e' (E is an example) and 'e' is found within the answer.
'in' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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