Wildly out of control (4)
I believe the answer is:
amok
'wildly out of control' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for amok that I've seen before include "going wild" , "Frenzied, running out of control" , "Running wild" , "(Run) in murderous frenzy" , "(Run) in frenzied state" .)