A class 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.
Maybe you can see an association between them that I don't see?
'a class' is the wordplay.
'a' becomes 'per'.
'class' becomes 'form' (synonyms).
'per'+'form'='PERFORM'
(Other definitions for perform that I've seen before include "Act - accomplish" , "Carry out (action)" , "function" , "seen to make a profit?" , "Carry out (duties)" .)