Messy situation (5)
I believe the answer is:
snafu
'messy situation' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for snafu that I've seen before include "in a bad state" , "Mess table" , "Bloomer" , "Slangy acronym meaning in total confusion" , "a mess of things" .)