It's shocking to get incorrect order regularly (5)
I believe the answer is:
outre
'it's shocking' is the definition.
(I've seen this before)
'get incorrect order regularly' is the wordplay.
'get' says to put letters next to each other.
'incorrect' becomes 'out'.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternate letters of 'order' are 're'.
'out' put next to 're' is 'OUTRE'.
'to' acts as a link.
(Other definitions for outre that I've seen before include "Beyond the usual" , "Eccentric, improper" , "Extravagant; bizarre" , "Far out - in France" , "Extravagant, rather shocking" .)