The most common and most likely answer to this crossword clue is the 8 letter word ROSSETTI
I've seen this crossword clue in The Daily Telegraph
R
O
S
S
E
T
T
I
More clues leading to the result ROSSETTI
- Some macros set time at 10 or 7:15
- Poet, otherwise sister to poet and painter
- Painter to resist making amendments
- Poet has single girl introduced to mountain climbing
- Weird stories about giant’s end
- Painter decided to enrich food in Switzerland?
- Poet rude to sister
- Poet and explorer with unusual title left out
- Poet to resist changes
- So, sitter’s spread out for artist
Buddy explains!

The straight part
We know that "Poet" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case poet = rossetti.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.