In disarray (6)
'in disarray' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for messy that I've seen before include "Untidy, dirty" , "Dirty and disorderly" , "Disorganised" .)
(Other definitions for untidy that I've seen before include "Disorderly, messy" , "Disorderly and slovenly" , "in a state" , "Not inclined to be neat" , "Far from neat" .)