I ran away from Australians in Rush (7)

I believe the answer is:

assault

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'rush' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

(Other definitions for assault that I've seen before include "Violent attack in action or words" , "Onslaught" , "Mount an attack" , "raid" , "Attack associated with" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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