What does the cryptic crossword clue "Mademoiselle is terrifying holding a spear (7)" mean?

The definition is "spear". The wordplay uses a hidden word. Hidden in madamoisel LE IS TERi fying The answer is LEISTER.

Mademoiselle is terrifying holding a spear (7)

Independent Cryptic #11752 | 17 Down | 2024-06-10 flower