Unruly as well as lacking a design (7)
I believe the answer is:
lawless
'unruly' is the definition.
(I've seen this before)
'as well as lacking a design' is the wordplay.
'lacking' suggests deleting specific letters.
'design' is an anagram indicator.
'as'+'well'+'as'='aswellas'
'aswellas' with 'a' taken away is 'swellas'.
'swellas' with letters rearranged gives 'LAWLESS'.
(Other definitions for lawless that I've seen before include "Anarchy" , "disobedient" , "Without rules" , "Ungoverned" , "Wild wild" .)