What does the cryptic crossword clue "Classic sandcastle — Geraldine holds with symmetry (2,5)" mean?

The definition is "Classic". The wordplay uses a hidden word. Hidden in "classic sandcaSTLE — GERaldine holds with symmetry" The answer is ST LEGER.

Classic sandcastle — Geraldine holds with symmetry (2,5)

Times Cryptic #29254 | 28 Across | 2025-06-12 flower