Author who created significant work during July's sessions! (5,5)
I believe the answer is:
james joyce
'author who created significant work during july's sessions' is the definition.
'james joyce' can be an answer for 'author' (I've seen this before). I'm not sure about the remainder of the definition.
'author who' is the wordplay.
'author' becomes 'James' (James is an example).
'who' becomes 'joyce' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'james'+'joyce'='JAMES JOYCE'
Can you help me to learn more?
(Other definitions for james joyce that I've seen before include "Irish writer" , "Irish novelist" , "Irish author" .)