Fine English retreat, right with a window (8)
I believe the answer is:
fenestra
'window' is the definition.
(I've seen this before)
'fine english retreat right with a' is the wordplay.
'fine' becomes 'f' (abbreviation).
'english' becomes 'e' (abbreviation).
'retreat' becomes 'nest' (nest is a kind of retreat**).
'right' becomes 'r' (common abbreviation).
'with' means one lot of letters go next to another.
'f'+'e'+'nest'+'r'+'a'='FENESTRA'
(Other definitions for fenestra that I've seen before include "Spot with tigers" , "window" .)