Very bad, a mobile ban all over the place (10)
I believe the answer is:
abominable
'very bad' is the definition.
'a mobile ban all over the place' is the wordplay.
'all over the place' indicates an anagram.
'mobile'+'ban'='mobileban'
'mobileban' is an anagram of 'bominable'.
'a'+'bominable'='ABOMINABLE'
(Other definitions for abominable that I've seen before include "Odious" , "Atrocious" , "Causing moral revulsion" , "Hateful" , "Very bad, terrible" .)