What does the cryptic crossword clue "Approach clear river (8)" mean?

The definition is "river". The wordplay uses a charade (building blocks). OVERT (synonym of "clear") + URE (synonym of "river"); definition: "Approach" The answer is OVERTURE.

Approach clear river (8)

Guardian #28811 | 26 Across | 2022-07-16 flower

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