Group of countries not ending obstruction (4)

I believe the answer is:

bloc

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'group of countries' is the definition.
(group of associated nations, eg the Eastern bloc)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for bloc that I've seen before include "Group of allied nations" , "Alliance of nations" , "Group of countries in special alliance" , "Group of countries with a shared aim" , "united nations" .)

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