Part of a teach-in generally is giving distress (6)
I believe the answer is:
aching
'distress' is the definition.
(thesaurus)
'part of a teach-in generally is' is the wordplay.
'part of' says the answer is hidden in the clue.
'ACHING' can be found hidden inside 'teach in generally is'.
'giving' acts as a link.
(Other definitions for aching that I've seen before include "Painful" , "Giving continuous pain" , "Sore" , "Yearning; in pain" , "Continuously sensitive" .)