Green issue (5)
I believe the answer is:
young
I believe this clue is a double definition.
'green' is the first definition.
(I've seen this before)
'issue' is the second definition.
(thesaurus)
(Other definitions for young that I've seen before include "At an early stage of development" , "Offspring (of animals etc)" , "Offspring; immature" , "Not yet grown" , "Born recently" .)