The most common and most likely answer to this crossword clue is the 6 plus 3 letter word POSTER BOY
I've seen this crossword clue in Independent
P
O
S
T
E
R
B
O
Y
More clues leading to the result POSTER BOY
Buddy explains!
The straight part
We know that "Attractive fellow" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case attractive fellow = poster boy.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.