Will go away (5)
I believe the answer is:
leave
I believe this is a double definition.
'will' is the first definition.
(synonyms)
'go away' is the second definition.
(synonyms)
(Other definitions for leave that I've seen before include "Permission to do something" , "Time off; go" , "Break" , "Relinquish - holiday" , "Permission - time off" .)