Lacking order (9)
I believe the answer is:
haphazard
'lacking order' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for haphazard that I've seen before include "Lacking any obvious organisation" , "Slapdash, slipshod" , "Careless or random" , "Erratic" , "Lacking order" .)