Sheet of window glass (4)

I believe the answer is:

pane

'sheet of window glass' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for pane that I've seen before include "Piece of glass in window" , "Single sheet of glass in a window" , "Panel of glass" .)

I've seen this clue in The Irish Times and The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.