Kind of decision (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
snap
'kind of decision' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for snap that I've seen before include "Crack - shot" , "Picture" , "Break suddenly and cleanly" , "Family helper" , "that's a copy!" .)