Ring a tree surgeon, without great desire for treatment? (8)
I believe the answer is:
resonate
'ring' is the definition.
(thesaurus)
I don't understand how the remainder of the clue works.
(Other definitions for resonate that I've seen before include "Resound" , "Vibrate sympathetically - ears note (anag)" , "Vibrate at the same frequency" , "make a vibrating effect" , "Continue to ring" .)