Application for admission (5)
I believe the answer is:
entry
This clue might be a double definition.
'application' is the first definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'admission' is the second definition.
(I've seen this before)
'for' acts as a link.
Can you help me to learn more?
(Other definitions for entry that I've seen before include "Way in; item in list" , "Competitors - way in" , "Door; appearance" , "Door, access" , "contestant" .)