What does the cryptic crossword clue "French mark I called squiggly (7)" mean?

The definition is "French mark". The wordplay uses an anagram. anagram of I + CALLED = CEDILLA; definition: "French mark" The answer is Cedilla.

French mark I called squiggly (7)

Telegraph Prize Cryptic #3042 | 27 Across | 2020-02-09 flower