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Drastic solution to a union dispute (7)

Ross

I believe the answer is:

divorce

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This might be a double definition.

'drastic solution' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'union dispute' is the second definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe there's an association between them I don't understand?

'to a' acts as a link.

Can you help me to learn more?

(Other definitions for divorce that I've seen before include "Legal end to a marriage" , "Break-up" , "Split" , "Ending of marriage" , "End one's marriage" .)

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