Get Bonita sloshed (6)
I believe the answer is:
obtain
'get' is the definition.
(I know that get can be written as obtain)
'bonita sloshed' is the wordplay.
'sloshed' indicates an anagram.
'bonita' with letters rearranged gives 'OBTAIN'.
(Other definitions for obtain that I've seen before include "Acquire, secure" , "Get, procure" , "Hold good" , "Gain possession of" , "Get or lay hold of" .)