Crossword Genius

Slow yankee replacing final third of blue box (5)

Ross

I believe the answer is:

tardy

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'slow' is the definition.
(tardy means running late)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for tardy that I've seen before include "Belated" , "Late; sluggish" , "Dilatory" , "Late, delayed" , "Behindhand" .)

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