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Rivals in union: one French -- righteous, utterly -- facing Scotsman linked to church (6,8)

Ross

I believe the answer is:

unholy alliance

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'rivals in union' is the definition.

I can't explain the remainder of the clue.

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(Other definitions for unholy alliance that I've seen before include "seemingly unlikely coalition" , "Not a church wedding" , "Its participants don't like each other!" .)

I've seen this clue in The Telegraph.
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