Confused mess (6)
(Other definitions for tangle that I've seen before include "Twist into a confused mass, say wool" , "Snarl-up" , "Get knotted!" , "Confused interwoven mass" , "A fight; seaweed" .)
'confused mess' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for muddle that I've seen before include "State of confusion and disorder" , "mix-up" , "Confused state" , "Confused mess" , "Confusion - mess" .)