Bay window, old, that is embraced by right and left (5)
I believe the answer is:
oriel
This clue could be a double definition.
'bay' is the first definition.
(I've seen this before)
'window old that is embraced by right and left' is the second definition.
'oriel' can be an answer for 'window' (oriel is a type of window). I'm not certain of the rest of the definition.
Can you help me to learn more?
(Other definitions for oriel that I've seen before include "Window built out from upper floor" , "Projecting window in upper story" , "Form of bay window" , "English college" , "Projecting bay window -- Oxford college" .)