Worry about issue (5)
I believe the answer is:
brood
I believe this clue is a double definition.
'worry' is the first definition.
('brood' can be a synonym of 'worry')
'issue' is the second definition.
(thesaurus)
'about' is the link.
(Other definitions for brood that I've seen before include "Family of young birds" , "Ponder - family" , "Sulk; incubate" , "Think anxiously for some time" , "Hatch" .)