Crossword Genius

Plus ___ (Spain's national motto) (5)

Ross

I believe the answer is:

ultra

(Other definitions for ultra that I've seen before include "Extreme - extremist" , "Prefix meaning beyond or extremely" , "Prefix meaning beyond or excessively" , "(As prefix) beyond or extreme" , "Secret intelligence" .)

I've seen this clue in The New York Times.
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