Out of control in the morning, then fine (4)
I believe the answer is:
amok
'out of control' is the definition.
(I've seen this before)
'morning then fine' is the wordplay.
'morning' becomes 'am'.
'then' says to put letters next to each other.
'fine' becomes 'ok' ('OK' can be a synonym of 'fine').
'am'+'ok'='AMOK'
'in the' is the link.
(Other definitions for amok that I've seen before include "A state of murderous frenzy" , "(Run) wild, out of control" , "(Run) in frenzied state" , "Wild and uncontrollable" , "Going mad" .)