Subversive type to use bar, drunk (8)
I believe the answer is:
saboteur
'subversive type' is the definition.
(saboteurs are subversive people)
'to use bar drunk' is the wordplay.
'drunk' indicates an anagram.
'to'+'use'+'bar'='tousebar'
'tousebar' anagrammed gives 'SABOTEUR'.
(Other definitions for saboteur that I've seen before include "One who wrecks" , "Underminer, wrecker" , "One who disrupts or damages by design" , "One causes damage for political reasons" , "One who deliberately subverts" .)