Crossword Genius

Union of US in disorder (6)

Ross

I believe the answer is:

fusion

'union' is the definition.
(fusion is a kind of union)

'of us in disorder' is the wordplay.
'disorder' indicates an anagram (a disordered version of the letters).
'of'+'us'+'in'='ofusin'
'ofusin' anagrammed gives 'FUSION'.

(Other definitions for fusion that I've seen before include "A welding" , "The process of joining two or more into one" , "Atomic reaction" , "Mixed musical style" , "Unification, maybe nuclear" .)

I've seen this clue in The Globe and Mail.
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