Spreading Euro-libels, against Government's wishes? (10)
I believe the answer is:
rebellious
'against government's wishes?' is the definition.
(a rebellion might oppose a government)
'spreading euro-libels' is the wordplay.
'spreading' indicates an anagram.
'euro'+'libels'='eurolibels'
'eurolibels' with letters rearranged gives 'REBELLIOUS'.
(Other definitions for rebellious that I've seen before include "Boxers were once so" , "Defiant" , "Resisting authority" , "Mutinous" , "Difficult to control, unmanageable" .)