Latino chap getting invited by a royal in Europe (9)
I believe the answer is:
argentine
'latino' is the definition.
(Argentina is a Latin American country)
'chap getting invited by a royal in europe' is the wordplay.
'chap' becomes 'gent' (I've seen this in other clues).
'getting invited by' means one lot of letters goes inside another (some letters invite other letters inside).
'royal in europe' becomes 'rine' (I am not sure about this - if you are sure you should believe this answer much more).
'a'+'rine'='arine'
'gent' placed within 'arine' is 'ARGENTINE'.
(Other definitions for argentine that I've seen before include "El Papa is one" , "South American" , "National" , "silvery" , "fish" .)