What does the cryptic crossword clue "Tragedian chooses half of play for adaptation (9)" mean?

The definition is "Tragedian". The wordplay uses an anagram. anagram of CHOOSES PL = SOPHOCLES; definition: "Tragedian" The answer is SOPHOCLES.

Tragedian chooses half of play for adaptation (9)

Guardian Cryptic #29634 | 15 Down | 2025-03-05 flower