What does the cryptic crossword clue "Handle isn't working with frame (5,4)" mean?

The definition is "Handle". The wordplay uses an anagram. anagram of ISN'T + FRAME = FIRST NAME; definition: "Handle" The answer is FIRST NAME.

Handle isn't working with frame (5,4)

Times Cryptic #28789 | 12 Across | 2023-12-18 flower