Crossword Genius

Gentlemen possibly held dear (4)

Ross

I believe the answer is:

sirs

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'gentlemen' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

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(Other definitions for sirs that I've seen before include "Gentlemen" , "Knights" , "men" .)

I've seen this clue in the Evening Standard.
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