What does the cryptic crossword clue "I must stop tosser spinning yarns (7)" mean?

The definition is "yarns". The wordplay uses an anagram. anagram of I + TOSSER = STORIES; definition: "yarns" The answer is STORIES.

I must stop tosser spinning yarns (7)

Independent Cryptic #11823 | 5 Across | 2024-08-31 flower