One may walk through this sort of light (6,6)
I believe the answer is:
french window
'one may walk' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'this sort of light' is the wordplay.
'this sort of' becomes 'french' (I am not sure about this - if you are sure you should believe this answer much more).
'light' becomes 'window' (light can mean a window or opening).
'french'+'window'='FRENCH WINDOW'
'through' is the link.
Can you help me to learn more?
(Other definitions for french window that I've seen before include "Glazed way out to garden/balcony" , "Glass door" , "Patio door?" , "Glazed door" .)