Dirt nieces dished up, being tactless (10)
I believe the answer is:
indiscreet
'tactless' is the definition.
(thesaurus)
'dirt nieces dished up' is the wordplay.
'dished up' indicates anagramming the letters.
'dirt'+'nieces'='dirtnieces'
'dirtnieces' with letters rearranged gives 'INDISCREET'.
'being' acts as a link.
(Other definitions for indiscreet that I've seen before include "Tactless" , "Too ready to reveal secret things" , "Too ready to tell secrets" , "Injudicious (anag of 6, 9 and 23)" , "shameless" .)