Country actor sharing top role in cinema appearance first of all (5,4)
I believe the answer is:
costa rica
'country' is the definition.
(Costa Rica is an example)
'actor sharing top role in cinema appearance first of all' is the wordplay.
'actor sharing' becomes 'costa' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'top' suggests taking the first letters.
'first of all' says to take the initial letters.
The first letters of 'role in' is 'ri'.
The initial letters of 'cinema appearance' is 'ca'.
'costa'+'ri'+'ca'='COSTA RICA'
Can you help me to learn more?
(Other definitions for costa rica that I've seen before include "source of coffee" , "place in Central America" , "Central American republic" , "Central American country, capital San Jose" , "international team?" .)