I'm back home right at lunchtime, having soup (10)

I believe the answer is:

minestrone

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'soup' is the definition.
(minestrone is a kind of soup)

'i'm back home right at lunchtime' is the wordplay.
'back' is a reversal indicator.
'home' becomes 'nest' (a bird's home).
'right at lunchtime' becomes 'rone' (I can't justify this - if you can you should give a lot more credence to this answer).
'im' backwards is 'mi'.
'mi'+'nest'+'rone'='MINESTRONE'

'having' acts as a link.

Can you help me to learn more?

(Other definitions for minestrone that I've seen before include "Dish" , "Item on menu" , "Italian soup" , "A starter" , "F" .)

I've seen this clue in the Evening Standard.

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