What does the cryptic crossword clue "More glamorous bird, perhaps circling tree (8)" mean?

The wordplay uses a container (one word inside another). ASH (synonym="”tree”") in FLIER (synonym="”bird") = FLASHIER The answer is FLASHIER.

More glamorous bird, perhaps circling tree (8)

Guardian Cryptic #29466 | 6 Down | 2024-08-20 flower