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Policy threat to both government and opposition? (5,5)

Ross

I believe the answer is:

third party

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'opposition?' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?

I don't understand the remainder of the clue.

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(Other definitions for third party that I've seen before include "Person besides the two primarily involved" , "Someone other than the principals" , "Liberals once?" , "Another (uninvolved) person" , "Person not directly involved" .)

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