Crossword Genius

Tory in the navy? (4)

Ross

I believe the answer is:

blue

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'navy?' is the definition.
(navy is a kind of blue)

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

Can you help me to learn more?

(Other definitions for blue that I've seen before include "Such humour < makes conservative" , "Conservative > depressed" , "Miserable; waste (money)" , "Dismal" , "Sea colour" .)

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