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I don't understand what that bold part mean.
Is this a set phrase?
晴れて is a adverb and it means "overtly","publicly","openly". So 晴れて自由の身だ means I am openly free. See 晴れて in goo 辞書.
For example, 晴れて夫婦になる, 晴れて無罪となる.
Required, but never shown