Blue-blooded blokes (5)
I believe the answer is:
royal
'blue' is the definition.
(royal blue is a kind of blue)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for royal that I've seen before include "First-rate" , "Relating to king/queen" , "Member of ruling family" , "Shade of blue" , "Magnificent" .)