Crossword Genius

Officer of the crown (5)

Ross

I believe the answer is:

major

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'officer' is the definition.
(type of military officer)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for major that I've seen before include "grave" , "5,27 [PRIME MINISTER]" , "Important, significant" , "Chief - officer" , "Of great importance" .)

I've seen this clue in the Evening Standard.
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