Final fiesta of summer jubilee was lavish again, but slightly different (6)

I believe the answer is:

afresh

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'again but slightly different' is the definition.
I can't tell whether this definition defines the answer.

'final fiesta of summer jubilee was lavish' is the wordplay.
'final' suggests the final letters.
The final letters of 'fiesta of summer jubilee was lavish' are 'AFRESH'.

Can you help me to learn more?

(Other definitions for afresh that I've seen before include "Anew, from the beginning" , "In a new way" , "Newly" , "Academy award" , "In a different way" .)

I've seen this clue in The Irish Times.

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