Suspended the old barbarian for good! (4)
I believe the answer is:
hung
'suspended' is the definition.
(I've seen this before)
'the old barbarian for good' is the wordplay.
'the old barbarian' becomes 'hun'.
'for' is a charade indicator (letters next to each other).
'good' becomes 'g' (abbreviation).
'hun'+'g'='HUNG'
(Other definitions for hung that I've seen before include "(Of parliament) with no overall majority" , "(Of a jury) unable to agree on a verdict" , "Dangled" , "(Of a painting) exhibited (in a gallery)" , "Suspended" .)