Crossword Genius

Boys in blue (5)

Ross

I believe the answer is:

royal

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

This could be a double definition.

'boys in' is the first definition.
Both the definition and answer are adjectives. Maybe you can see a link between them that I can't see?

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

Can you help me to learn more?

(Other definitions for royal that I've seen before include "Wills, perhaps" , "Old gold coin -- stag with 12 or more points" , "Kingly or queenly" , "Member of ruling family" , "Of sovereigns" .)

I've seen this clue in the Evening Standard.
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