What does the cryptic crossword clue "Child star on the radio (3)" mean?

The definition is "Child". The wordplay uses a charade (building blocks). S (abbreviation="star") + ON (from clue) = SON; definition: "Child" The answer is SON.

Child star on the radio (3)

Independent Cryptic #11400 | 27 Down | 2023-04-26 flower

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Telegraph Prize Cryptic #3002 (2019-05-05)