Unable to see what may be on the window (5)
I believe the answer is:
blind
This could be a double definition.
'unable to see' is the first definition.
(I've seen this before)
'may be on the window' is the second definition.
I know that 'window' relates to this answer. I also know that both the answer and definition are singular nouns
'what' is the link.
Can you help me to learn more?
(Other definitions for blind that I've seen before include "Like a bat" , "Unseeing" , "Visually challenged" , "relying on instruments" , "Unobserving" .)