Corrupt characters from USA, East Bengal, that Labour cleaned out (6,7)
I believe the answer is:
augean stables
'that labour cleaned out' is the definition.
(cleaning it was one of Hercules' labours)
'corrupt characters from usa east bengal' is the wordplay.
'corrupt characters from' is an anagram indicator (characters must be messed up or corrupted).
'usa'+'east'+'bengal'='usaeastbengal'
'usaeastbengal' anagrammed gives 'AUGEAN STABLES'.
(Other definitions for augean stables that I've seen before include "that needed flushing out" , "filthy old place" , "Hercules cleaned them" , "One of Hercules' labours" .)