A document creating act (7)
I believe the answer is:
perform
'act' is the definition.
The definition and answer can be both to do with creating things as well as being verbs in their base form.
Perhaps you can see an association between them that I don't see?
'a document' is the wordplay.
'a' becomes 'per'.
'document' becomes 'form' (form is a kind of document).
'per'+'form'='PERFORM'
'creating' is the link.
Can you help me to learn more?
(Other definitions for perform that I've seen before include "Do a good job" , "Carry out; act" , "Carry out, accomplish" , "Carry out (duties)" , "Carry out (action)" .)