What does the cryptic crossword clue "Nuclear power source, unstable at core, on river (7)" mean?

The definition is "river". The wordplay uses anagram, charade. anagram of ATCORE ("at core,") + R (abbreviation of "river") [anagram: "unstable"] = REACTOR; definition: "Nuclear power source," The answer is REACTOR.

Nuclear power source, unstable at core, on river (7)

Times Cryptic #27938 | 15 Across | 2021-03-30 flower

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Telegraph #29996 (2022-05-25)