Crossword Genius

Blue blooded boys (5)

Ross

I believe the answer is:

royal

I'm a little stuck... Click here to teach me more about this clue!

'blue' is the definition.
(royal blue is a kind of blue)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for royal that I've seen before include "Member of ruling family" , "complete" , "Queen, say?" , "- - Shakespeare Company (RSC)" , "King, queen, prince or princess?" .)

I've seen this clue in the Evening Standard.
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