Do without it, as ban involved (7)
I believe the answer is:
abstain
'do without' is the definition.
(I've seen this before)
'it as ban involved' is the wordplay.
'involved' is an anagram indicator (involved can mean confusing or complex).
'it'+'as'+'ban'='itasban'
'itasban' is an anagram of 'ABSTAIN'.
(Other definitions for abstain that I've seen before include "not come down on either side" , "Choose not to consume" , "Formally decline to vote" , "Choose not to vote, or drink" , "Give backing to" .)