Knight's title (3)

I believe the answer is:

sir

'knight's title' is the definition.
(knights are addressed as 'sir')

This is the entire clue.

(Other definitions for sir that I've seen before include "Title of Kt or Bart" , "Honourable title" , "Formal term of address" , "Poet and novelist" , "Formal and deferential address to a man" .)

I've seen this clue in The Wall Street Journal, The Times, The Daily Mail, The Sun, the LA Times, The Telegraph, the King Feature Syndicate, the Newsday, the Sydney Morning Herald, The Mirror, the Universal, the Evening Standard, The Irish Times, The New York Times, the Penny Press, the USA Today, The Star Tribune, The Washington Post and The Independent.

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