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Political group’s announced restrictive measure (4)

Ross

I believe the answer is:

bloc

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This could be a double definition.

'political group's' is the first definition.
(I've seen this before)

'announced restrictive measure' is the second definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

Can you help me to learn more?

(Other definitions for bloc that I've seen before include "Political coalition" , "Group of allied nations" , "Group with a common policy" , "multinational group" , "People cooperating" .)

I've seen this clue in The Times.
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