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 (literal="on") = SON; definition: "Child" The answer is Son.

Child star on the radio? (3)

Telegraph Prize Cryptic #3002 | 27 Across | 2019-05-05 flower

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