Part of joint actually undamaged (6)
I believe the answer is:
intact
'undamaged' is the definition.
(thesaurus)
'part of joint actually' is the wordplay.
'part of' says the answer is hidden in the clue.
'INTACT' is hidden in the letters of 'joint actually'.
(Other definitions for intact that I've seen before include "Whole and undamaged" , "Inviolate" , "Whole and unharmed" , "Undiminished" , "Entire and whole" .)