This marine is a blue (5)
I believe the answer is:
ultra
This could be a double definition.
'this marine' is the first definition.
Both the definition and answer are adjectives. Perhaps there's a link between them I don't understand?
'blue' is the second definition.
Both the definition and answer are adjectives. Perhaps there's a link between them I don't understand?
'is a' is the link.
Can you help me to learn more?
(Other definitions for ultra that I've seen before include "Prefix meaning excessively or extremely" , "Saharan dweller" , "Project started at Bletchley Park in 1939 to break the Enigma code" , "Extreme - extremist" , "(One who is) extreme (in eg political opinion)" .)