Royal person not initially in charge (6)
I believe the answer is:
prince
'royal person' is the definition.
(type of royal)
'not initially in charge' is the wordplay.
'not initially' becomes 'n' (I am not sure about this - if you are sure you should believe this answer much more).
'in' means one lot of letters goes inside another.
'charge' becomes 'price' (I've seen this in another clue).
'n' going inside 'price' is 'PRINCE'.
Can you help me to learn more?
(Other definitions for prince that I've seen before include "Son of a sovereign" , "See 1" , "Boxer Naseem Hamed's "title"" , "He's a royal" , "Son of a royal house" .)