Drop key objective introduced by Democrat (7)
I believe the answer is:
descend
'drop' is the definition.
(I've seen this in another clue)
'key objective introduced by democrat' is the wordplay.
'key' becomes 'esc' ('Escape' key on a computer keyboard).
'objective' becomes 'end' (both can mean a purpose).
'introduced by' means one lot of letters go next to another.
'democrat' becomes 'd'.
'esc'+'end'='escend'
'escend' put after 'd' is 'DESCEND'.
(Other definitions for descend that I've seen before include "Sink" , "Come down" , "Plunge" , "Move downwards" , "Climb down" .)