Presenter tainted concealing charm (9)
I believe the answer is:
entertain
'charm' is the definition.
'presenter tainted concealing' is the wordplay.
'concealing' says the answer is hidden in the clue.
'ENTERTAIN' is hidden in the letters of 'presenter tainted'.
(Other definitions for entertain that I've seen before include "Amuse; host" , "cheer" , "Provide amusement" , "Put up" , "nurse" .)