Emit; edition (5)
I believe the answer is:
issue
This clue is a double definition.
'emit' is the first definition.
(I've seen this in another clue)
'edition' is the second definition.
(eg edition of a magazine)
(Other definitions for issue that I've seen before include "Contentious subject" , "Circulate, distribute or equip with" , "Kids" , "Offspring; problem" , "Instalment" .)