Trattoria food shortcomings turning up? Eat quickly, finishing early (4,3)

I believe the answer is:

spag bol

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'trattoria food' is the definition.
'spag bol' can be an answer for 'food' (short for spaghetti Bolognese). I'm not sure about the 'trattoria' bit.

'shortcomings turning up? eat quickly finishing early' is the wordplay.
'shortcomings' becomes 'gaps' (I can't justify this - if you can you should believe this answer much more).
'turning up?' says the letters should be written in reverse.
'eat quickly' becomes 'bolt' (I've seen this before).
'finishing early' means to remove the last letter (the word finishes earlier than normal).
'gaps' in reverse letter order is 'spag'.
'bolt' with its last letter removed is 'bol'.
'spag'+'bol'='SPAG BOL'

Can you help me to learn more?

(Another definition for spag bol that I've seen is " Simple meat and pasta dish (abbr)".)

I've seen this clue in The Independent.

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