Diplomacy (4)

I think it could be either:

tact

dact

'diplomacy' is the definition.
(tact can mean diplomacy or sensitivity)

This is all the clue.

(Other definitions for tact that I've seen before include "Sensitivity in dealing with people" , "Consideration in dealing with others" , "Delicacy of feeling, skill in saying the right thing" , "Skill in dealing with people" , "Fine perception" .)

I've seen this clue in The Guardian, the King Feature Syndicate, The Wall Street Journal, the Sydney Morning Herald, The Star Tribune, the Newsday, The Telegraph, The Mirror, The Times, the Evening Standard and The Independent.

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