Mix up clothes with loose ends (6)
I believe the answer is:
garble
'mix up' is the definition.
(I've seen this in another clue)
'clothes with loose ends' is the wordplay.
'clothes' becomes 'garb' (garb is a kind of clothes).
'with' is a charade indicator (letters next to each other).
'ends' suggests removing the centre.
'loose' with its centre removed is 'le'.
'garb'+'le'='GARBLE'
(Other definitions for garble that I've seen before include "Indistinct speech" , "Distort text or its meaning" , "jumble" , "Confuse (a message)" , "Corrupt" .)