Plant with curative properties damaged crania (6)
I believe the answer is:
arnica
'plant with curative properties' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'damaged crania' is the wordplay.
'damaged' indicates an anagram.
'crania' is an anagram of 'ARNICA'.
Can you help me to learn more?
(Other definitions for arnica that I've seen before include "Tincture of mountain tobacco, good for bruises, etc" , "Application" , "Tincture for treating bruises" , "Plant preparation to treat bruises" , "Herbal remedy for bruising" .)