One of the primary colors (4)
'one of the primary colors' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for blue that I've seen before include "coarse" , "Unusual moon" , "in Oxford, it's dark" , "Dismal" , "entertaining rabbi" .)
'one of the primary colors' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for red that I've seen before include "River, its source in the US, flowing north to empty into L Winnipeg" , "could be a Marxist" , "The colour of the former Russian army" , "Flushed" , "Ruby" .)