Price of admission (3)
'price of admission' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for fee that I've seen before include "Sum payable to professional person for services" , "price" , "Charge for professional services" , "Cost" , "Amount paid for job" .)
(Other definitions for cover charge that I've seen before include "It's made by a restaurant" , "entrance fee?" .)