Crossword Genius

Alliance building? Not quite (4)

Ross

I believe the answer is:

bloc

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'alliance' is the definition.
(I know that bloc is a type of alliance)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for bloc that I've seen before include "Group whose members have common objectives" , "Alliance - coalition" , "Nations grouped for a purpose" , "A number of countries" , "united nations" .)

I've seen this clue in The Telegraph.
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