Bone of contention (9)
'bone of contention' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for issue that I've seen before include "Publish, bring out" , "Offspring; problem" , "Send out or distribute for use" , "Subject, result, or publication" , "Offspring or one of publication" .)
(Other definitions for grievance that I've seen before include "gripe" , "beef" , "Complaint" , "Bad feeling" , "Item causing resentment" .)