Prudence not impaired? Not at home (4)

I believe the answer is:

tact

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'prudence' is the definition.
(thesaurus)

I can't explain the rest of the clue.

(Other definitions for tact that I've seen before include "Sensitivity in dealings" , "Diplomatic sensitivity" , "Delicacy of feeling, skill in saying the right thing" , "Understanding" , "Sensitivity (in dealing with others)" .)

I've seen this clue in The Telegraph.

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