What does the cryptic crossword clue "Masterful play on Radio Three to start with (6)" mean?

The definition is "Masterful". The wordplay uses an anagram. anagram of RADIO T = ADROIT; definition: "Masterful" The answer is ADROIT.

Masterful play on Radio Three to start with (6)

Guardian Cryptic #29358 | 5 Across | 2024-04-16 flower