Nurse treated dent (4)
I believe the answer is:
tend
'nurse' is the definition.
(thesaurus)
'treated dent' is the wordplay.
'treated' is an anagram indicator.
'dent' is an anagram of 'TEND'.
(Other definitions for tend that I've seen before include "Look after - there's a dent in it" , "Incline, lean" , "Have inclination or care for" , "Look after (someone)" , "See to" .)