Crossword Genius

A sum union arranged agreed by all (9)

Ross

I believe the answer is:

unanimous

'agreed by all' is the definition.
(as in a unanimous decision)

'a sum union arranged' is the wordplay.
'arranged' indicates an anagram (letters rearranged).
'a'+'sum'+'union'='asumunion'
'asumunion' is an anagram of 'UNANIMOUS'.

(Other definitions for unanimous that I've seen before include "Acting together" , "All in agreement, no exceptions" , "With one mind" , "As one voice" , "Without one dissenter" .)

I've seen this clue in The Times.
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