Victory? Sore loser back in touch is claiming one … (7)

I believe the answer is:

triumph

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'victory?' is the definition.
(I know that triumph can be written as triumph)

'sore loser back in touch is claiming one' is the wordplay.
'sore loser' becomes 'trump' (I can't explain this - if you can you should give a lot more credence to this answer).
'back in' indicates one should take the final letters (the 'back' of the word).
'is claiming' means one lot of letters goes inside another.
'one' becomes 'i' (Roman numeral).
The final letter of 'touch' is 'h'.
'trump'+'h'='trumph'
'trumph' placed around 'i' is 'TRIUMPH'.

Can you help me to learn more?

(Other definitions for triumph that I've seen before include "Exult in victory" , "former car manufacturer" , "Outstanding victory" , "Be victorious" , "celebrate victory" .)

I've seen this clue in The Guardian.

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