Bless troubled nation (6)
I believe the answer is:
anoint
'bless' is the definition.
(I know this)
'troubled nation' is the wordplay.
'troubled' indicates an anagram.
'nation' is an anagram of 'ANOINT'.
(Other definitions for anoint that I've seen before include "Apply oil as part of a rite" , "Consecrate with holy oil" , "Consecrate with oil or ointment" , "Bless with holy oil" , "Administer a sacred oil" .)