Celebration of son getting back ending finally after one (7)

I believe the answer is:

shindig

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'celebration' is the definition.
(I've seen this before)

'son getting back ending finally after one' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'getting back' becomes 'hind' (I can't explain this - if you can you should believe this answer much more).
'finally' says to take the final letters.
'after' is a charade indicator (letters next to each other).
'one' becomes 'i' (Roman numeral).
The final letter of 'ending' is 'g'.
'g' put after 'i' is 'ig'.
's'+'hind'+'ig'='SHINDIG'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for shindig that I've seen before include "Noisy disturbance" , "Noisy knees-up" , "Bash" , "Hooley" , "Hidings (anag) - party" .)

I've seen this clue in The Guardian.

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