Royal daughter hosting a president (6)
I believe the answer is:
reagan
'president' is the definition.
(Ronald Reagan)
'royal daughter hosting a' is the wordplay.
'royal' becomes 'r' (abbreviation).
'daughter' becomes 'egan' (I can't explain this - if you can you should believe this answer much more).
'hosting' means one lot of letters goes inside another (inserted letters are welcomed in or hosted).
'egan' going around 'a' is 'eagan'.
'r'+'eagan'='REAGAN'
Can you help me to learn more?
(Other definitions for reagan that I've seen before include "US president, 1981-89" , "head of state" , "40th president of the United States" , "leading actor, once?" , "Ronald . . . . . ., a film star and president" .)