Mistakenly drug Lenin's subordinate (9)
I believe the answer is:
underling
'subordinate' is the definition.
(I know that subordinate can be written as underling)
'mistakenly drug lenin's' is the wordplay.
'mistakenly' indicates anagramming the letters.
'drug'+'lenin'='druglenin'
'druglenin' with letters rearranged gives 'UNDERLING'.
(Other definitions for underling that I've seen before include "Subordinate" , "maid perhaps" , "A junior" , "Lackey" .)