What does the cryptic crossword clue "A quiet river location, well chosen (8)" mean?

The definition is "well chosen". The wordplay uses a charade (building blocks). A (abbreviation="A") + P (abbreviation="quiet") + PO (synonym="river") + SITE (synonym="location,") = APPOSITE; definition: "well chosen" The answer is Apposite.

A quiet river location, well chosen (8)

Telegraph #28067 | 10 Across | 2016-03-21 flower

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Also seen in

Guardian Cryptic #25539 (2012-01-23)