It's good to freak out in a place of grief (5)
I believe the answer is:
grave
'a place of grief' is the definition.
(where someone might grieve)
'it's good to freak out' is the wordplay.
'it's good' becomes 'g' (abbreviation).
'to freak out' becomes 'rave' (both can mean to party).
'g'+'rave'='GRAVE'
'in' acts as a link.
(Other definitions for grave that I've seen before include "Serious in a crypt" , "Burial site" , "Sober" , "Hazardous" , "In which to lay a corpse" .)