Symbolic barrier named by Winston Churchill (4,7)

I believe the answer is:

iron curtain

(Other definitions for iron curtain that I've seen before include "Notional barrier between East and West" , "former division in Europe" , "Former barrier across Europe" , "severe barrier to communication" , "Notional C 20 barrier across Europe" .)

I've seen this clue in The Sunday Times and The Times.

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