What does the cryptic crossword clue "Leftie gets reprimand, being where celebs parade (3,6)" mean?

The wordplay uses a charade (building blocks). RED (synonym="”Leftie”") + CARPET (synonym="CARPET") = REDCARPET The answer is REDCARPET.

Leftie gets reprimand, being where celebs parade (3,6)

Guardian Cryptic #29457 | 17 Across | 2024-08-09 flower