Crossword Genius

Taken from vaults where entry's forbidden (3,2,6)

Ross

I believe the answer is:

out of bounds

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'forbidden' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

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(Other definitions for out of bounds that I've seen before include "taboo" , "Off limits" , "like an exhausted kangaroo?" , "lying beyond field of play?" , "Skipper so exhausted" .)

I've seen this clue in the Sydney Morning Herald.
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