Princely (5)
I believe the answer is:
regal
'princely' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for regal that I've seen before include "Kingly or queenly" , "'Majestic, royal (5)'" , "Fit for a king" , "Showing great dignity" , "King-like" .)