What does the cryptic crossword clue "Decaf lefty stirred in an unnatural way (10)" mean?

The wordplay uses an anagram. anagram of DECAFLEFTY ("Decaf lefty") [anagram: "stirred"] = AFFECTEDLY The answer is AFFECTEDLY.

Decaf lefty stirred in an unnatural way (10)

Independent Cryptic #11902 | 26 Across | 2024-12-02 flower