The most common and most likely answer to this crossword clue is the 6 letter word QUAINT
I've seen this crossword clue in The Daily Telegraph
Q
U
A
I
N
T
More clues leading to the result QUAINT
- Olde-worlde, but not quite antique strangely
- Answer in Quintagram not half odd
- Curious question is not badly put
- Quit an organisation that’s old fashioned
- Stop holding ‘amateur’ as meaning ‘lovably odd’
- Picturesque and unusual antique missing foot
- Charmingly archaic lift, without entrance, keeping popular
- Unusually piquant, not gentle or twee
- Attractively unusual one described by fashion designer
- Mini designer holds Issigonis’s original — it’s charmingly old-fashioned
Buddy explains!

The straight part
We know that "Attractively unusual" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case attractively unusual = quaint.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 QUAINT mean?
QUAINT adjective- Of a person: cunning, crafty.
- Cleverly made; artfully contrived.
- Strange or odd; unusual.
- Overly discriminating or needlessly meticulous; fastidious; prim.
- Pleasingly unusual; especially, having old-fashioned charm.
- The vulva.