Ruler rejects any dubious packages from the East (6)
I believe the answer is:
dynast
'ruler' is the definition.
(dynast is a kind of ruler)
'rejects any dubious packages from the east' is the wordplay.
'packages' says the answer is hidden in the clue (the answer is 'packaged' within the clue).
'from the east' shows that the letters should be reversed in order.
'tsanyd' is hidden in the letters of 'rejects any dubious'.
'tsanyd' in reverse letter order is 'DYNAST'.
(Other definitions for dynast that I've seen before include "Powerful hereditary ruler" , "One ruling" , "Member of a hereditary ruling family" .)