What provides transparency, hiding no secret, ultimately? (8)

I believe the answer is:

glasnost

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But I can't explain it at all! Could you help me understand?

(Other definitions for glasnost that I've seen before include "Openness (Russian)" , "Gorbachev initiative" , "Gorbachev's policy from 1985" , "Policy of openness under Gorbachev" , "Soviet policy of openness" .)

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