Is six set in order (6)
I believe the answer is:
exists
'is' is the definition.
The definition and answer can be both to do with fundamental existence as well as being verbs in their -s form.
Maybe you can see an association between them that I can't see?
'six set in order' is the wordplay.
'in order' indicates anagramming the letters (the letters in a new order).
'six'+'set'='sixset'
'sixset' with letters rearranged gives 'EXISTS'.
Can you help me to learn more?
(Other definitions for exists that I've seen before include "Has objective reality" , "Is present in the universe" , "Is present in the real world" , "Is extant" , "Has being, is actual" .)