The most common and most likely answer to this crossword clue is the 6 letter word SASHES
I've seen this crossword clue in The Daily Telegraph
S
A
S
H
E
S
More clues leading to the result SASHES
- Remains following the end of brass bands
- Frames second sporting trophy
- Special trees make containers for glass
- Window frames the girl in elite forces
- Bands of elite forces protecting the girl
- Windows operating system may include these five tests following launch of server
- Frames Boris as he steals bottles
- Frames lady in soldiers’ embrace
- Scarfs remains after last of leftovers
- She initially remains with waistbands
Buddy explains!

The straight part
We know that "Window frames" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case window frames = sashes.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 SASHES mean?
SASHES noun- A piece of cloth designed to be worn around the waist.
- A decorative length of cloth worn over the shoulder to the opposite hip, often for ceremonial or other formal occasions.
- The opening part (casement) of a window usually containing the glass panes, hinged to the jamb, or sliding up and down as in a sash window.
- A draggable vertical or horizontal bar used to adjust the relative sizes of two adjacent windows.
- In a sawmill, the rectangular frame in which the saw is strained and by which it is carried up and down with a reciprocating motion; the gate.