"Royal Wedding” star (7)
I believe the answer is:
astaire
'royal wedding star' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for astaire that I've seen before include "Fred -, twentieth century US dancer" , "Fred, Hollywood dancing icon" , "dance performer" , "Fred - - (films)" , "Fred, immortal Hollywood dancer" .)