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Admitted one may have had to pay it (8,3)

Ross

I believe the answer is:

entrance fee

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'it' is the definition.
The definition suggests a singular noun which matches the answer.

'admitted one may have had to pay' is the wordplay.
'admitted one may have' becomes 'entrance' (I can't justify this - if you can you should believe this answer much more).
'had' means one lot of letters go next to another.
'to pay' becomes 'fee'.
'entrance'+'fee'='ENTRANCE-FEE'

Can you help me to learn more?

(Other definitions for entrance fee that I've seen before include "Admission charge" , "Getting in charge" .)

I've seen this clue in The Globe and Mail.
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