Thoughtfulness (4)
'thoughtfulness' is the definition.
(I know that tact is a type of thoughtfulness)
This is all the clue.
(Other definitions for tact that I've seen before include "Diplomatic sensitivity" , "Understanding" , "Sensitivity in dealings" , "Sensitivity (in dealing with others)" , "Consideration and sensitivity" .)
'thoughtfulness' is the definition.
(I know that thoughtfulness can be written as consideration)
This is the entire clue.
(Other definitions for consideration that I've seen before include "factor to be borne in mind" , "Kindness" , "examination" , "A motive" , "Reward; careful thought" .)