Header omitted from paper edition (5)
I believe the answer is:
issue
'edition' is the definition.
(eg edition of a magazine)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for issue that I've seen before include "Come forth or bring out" , "The children to come forth" , "Topic; send out" , "Difficulty" , "Result, outcome; topic" .)