Crossword Genius

In agreement immediately about leaving (2,3)

Ross

I believe the answer is:

at one

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'in agreement' is the definition.
(thesaurus)

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(Other definitions for at one that I've seen before include "time to enjoy 21 and 15 [TURKEY and CRACKERS] s?" , "Agreed" , "In agreement" , "in harmony" .)

I've seen this clue in The Telegraph.
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