The most common and most likely answer to this crossword clue is the 3 plus 6 letter word BOW WINDOW
I've seen this crossword clue in The Sunday Telegraph
B
O
W
W
I
N
D
O
W
More clues leading to the result BOW WINDOW
- At home daughter is bitten by dog in alcove?
- Something opened inviting nervous dentist initially to prod canine
- Architectural feature setter perhaps files in drawer, initially
- How setter perhaps goes round India to find architectural feature
- Dog kennels in Germany, an architectural feature
- Architectural feature home had in Barking
- Curved feature in tail of hound, dog bites
- Something rounded and transparent, where dog keeps half-cooked dinner
- 8
Buddy explains!

The straight part
We know that "Curved feature" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case curved feature = bow window.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.