Erratic (13)
There are a few possibilities for this:
unpredictable
'erratic' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for unpredictable that I've seen before include "erratic" , "Capricious" , "Changeable" .)
'erratic' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for wayward that I've seen before include "Capricious and undisciplined" , "Awry" , "Erratic" , "Unpredictable, wilful" , "Childishly self-willed, unruly" .)
'erratic' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for haywire that I've seen before include "Erratic, out of control" , "Not working properly" , "Crazy - not functioning properly" , "Erratic (colloq.)" , "Malfunctioning badly" .)