What does the cryptic crossword clue "Replacing tip on cue that's dull (8)" mean?

The definition is "dull". The wordplay uses an anagram. anagram of TIP + ON + CUE = UNPOETIC; definition: "dull" The answer is UNPOETIC.

Replacing tip on cue that's dull (8)

Independent Cryptic #11617 | 25 Across | 2024-01-04 flower