Carbuncle anatomist discovered is dirty (7)
I believe the answer is:
unclean
'is dirty' is the definition.
(synonyms)
'carbuncle anatomist discovered' is the wordplay.
'discovered' indicates the answer is hidden within the clue (remove the letters covering the answer in the clue).
'UNCLEAN' can be found hidden inside 'carbuncle anatomist'.
(Other definitions for unclean that I've seen before include "Dirty, needs a wash" , "Dirty or unwashed" , "Soiled like an uncle" , "Contaminated" , "Defiled" .)