What does the cryptic crossword clue "Orchestra pits played extremely high (13)" mean?

The wordplay uses an anagram. anagram of ORCHESTRA (synonym="ORCHESTRA") + PITS (synonym="PITS") = STRATOSPHERIC The answer is STRATOSPHERIC.

Orchestra pits played extremely high (13)

Guardian Cryptic #29370 | 8 Down | 2024-04-30 flower