What does the cryptic crossword clue "Broadcast rally includes some Roman stars (5)" mean?

The wordplay uses a hidden word. Hidden in broadcAST RAlly – Latin for stars, as in the RAF motto ‘Per ardua ad astra’ The answer is ASTRA.

Broadcast rally includes some Roman stars (5)

Guardian Cryptic #29138 | 9 Across | 2023-08-02 flower