Uneaten food having gone before bowling spells (9)

I believe the answer is:

leftovers

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'uneaten food having' is the definition.
I can't judge whether this defines the answer.

'gone before bowling spells' is the wordplay.
'gone' becomes 'left' (I've seen this in another clue).
'before' is a charade indicator (letters next to each other).
'bowling spells' becomes 'overs' (I've seen this before).
'left'+'overs'='LEFTOVERS'

Can you help me to learn more?

(Other definitions for leftovers that I've seen before include "Uneaten scraps" , "survivors" , "Remains" .)

I've seen this clue in The Daily Express.

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