Pub's to exclude one caught being uncouth (8)
I believe the answer is:
'uncouth' is the definition.
'pub's to exclude one caught' is the wordplay.
'pub' becomes 'bar' (I've seen this before).
'to exclude' becomes 'bar' ('bar' can be a synonym of 'exclude').
'one' becomes 'i' (Roman numeral).
'caught' becomes 'c' (cricket abbreviation).
'being' acts as a link.
(Other definitions for barbaric that I've seen before include "Savagely cruel" , "Cruel and brutal" , "lacking in refinement" , "Like 24 [BRUTE]" , "Cruel; primitive" .)