Crossword Genius

Masterly title (3)

Ross

I believe the answer is:

sir

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'title' is the definition.
(respectful address for a man)

I cannot understand how the remainder of the clue works.

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(Other definitions for sir that I've seen before include "Polite form of address to a man" , "Gentleman's form of address" , "address to teacher" , "Polite or formal address to male" , "Formal term of address" .)

I've seen this clue in the Evening Standard.
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