Short sight (7)
I believe the answer is:
glimpse
This clue could be a double definition.
'short' is the first definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'sight' is the second definition.
(I have seen 'Brief sight ' mean 'glimpse' so perhaps 'sight' could also mean 'glimpse')
Can you help me to learn more?
(Other definitions for glimpse that I've seen before include "Briefly catch sight of" , "A brief view or sighting" , "A quick look" , "Peek" , "Gander" .)