A positive result (10)
I believe the answer is:
photograph
This clue might be a double definition.
'a positive' is the first definition.
(thesaurus)
'result' is the second definition.
The definition and answer can be both to do with fundamental existence as well as being verbs in their base form.
Maybe there's a link between them I don't understand?
Can you help me to learn more?
(Other definitions for photograph that I've seen before include "Picture" , "Snapshot" .)