The most common and most likely answer to this crossword clue is the 13 letter word PREPOSSESSING
I've seen this crossword clue in The Sunday Telegraph
P
R
E
P
O
S
S
E
S
S
I
N
G
More clues leading to the result PREPOSSESSING
- Having round agent, attractive
- Fetching piano that needs taking back
- Ownership in advance is very attractive
- It’s vital to keep team winning
- Winning team inside pushing forward
- Attractive urgent coverage for legal support team
- Capturing armed band is vital for winning
- Winning, before bands break into song
- Vital to keep body attractive
- ‘Charming’ gang’s burning outside
Buddy explains!

The straight part
We know that "Attractive" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case attractive = prepossessing.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.
What does PREPOSSESSING mean?
PREPOSSESSING adjective- Tending to invite favor; attracting confidence, favor, esteem, or love; attractive
- Causing prejudice.