Thus employed drunk (6)
I believe the answer is:
soused
'drunk' is the definition.
(sousing is a kind of drinking)
'thus employed' is the wordplay.
'thus' becomes 'so' ('so' can be a synonym of 'thus').
'employed' becomes 'used' ('use' can be a synonym of 'employ').
'so'+'used'='SOUSED'
(Other definitions for soused that I've seen before include "Soaked, pickled (gherkin); drunk (colloq.)" , "Drenched with liquid" , "Drunk or immersed in liquid" , "Marinated" .)