Could it make duos celebrate end of alliance? (6,8)

I believe the answer is:

decree absolute

'could it' is the definition.
I can't judge whether this defines the answer.

'make duos celebrate end of alliance?' is the wordplay.
'make' indicates an anagram.
'end of' indicates one should take the final letters.
The final letter of 'alliance' is 'e'.
'duos'+'celebrate'='duoscelebrate'
'duoscelebrate' anagrammed gives 'decreeabsolut'.
'decreeabsolut'+'e'='DECREE ABSOLUTE'

(Another definition for decree absolute that I've seen is " Final divorce order".)

I've seen this clue in The Guardian.

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