What does the cryptic crossword clue "In carnival, a certain group of stars (7)" mean?

The definition is "group of stars". The wordplay uses a hidden word. Hidden in "in carnivaL, A CERTAin group of stars" The answer is LACERTA.

In carnival, a certain group of stars (7)

Guardian Cryptic #29481 | 1 Down | 2024-09-06 flower