It makes one admission after another (9)
I believe the answer is:
turnstile
'it makes one admission after another' is the definition.
The definition suggests a singular noun which matches the answer.
'it makes one admission after another' is the wordplay.
I cannot quite see how this works, but
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is located in the answer.
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
'another' could be 'r' (I've seen this in other clues) and 'r' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for turnstile that I've seen before include "where spectators pass" , "Pivoting gate, to football grounds say" , "Gate admitting one at a time" , "Mechanical entry gate" , "What controls access" .)