Just order a ban -- or else (10)
I believe the answer is:
reasonable
'just' is the definition.
(associated in meaning)
'order a ban or else' is the wordplay.
'order' indicates an anagram.
'a'+'ban'+'or'+'else'='abanorelse'
'abanorelse' anagrammed gives 'REASONABLE'.
(Other definitions for reasonable that I've seen before include "Fair, rational" , "description of rationality" , "Fair - inexpensive" , "Sound" , "Not excessive or extreme" .)