Impossible to get to this in court (3)
I believe the answer is:
ace
This could be a double definition.
'impossible to get to this in' is the first definition.
The definition and answer can be both quantities as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'court' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
(Other definitions for ace that I've seen before include "Possibly a diamond" , "Player who excels" , "Tennis serve that the receiver can't reach" , "Top card or winning tennis serve" , "One in playing-cards" .)