What does the cryptic crossword clue "Red has run before blue (7)" mean?

The definition is "Red". The wordplay uses a charade (building blocks). TROT (synonym="run") + SKY (synonym="blue") = TROTSKY; definition: "Red" The answer is Trotsky.

Red has run before blue (7)

Telegraph Prize Cryptic #3074 | 3 Down | 2020-09-20 flower

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