Get rid of heartless dictate after a long time (9)
I believe the answer is:
eradicate
'get rid of' is the definition.
(I've seen this before)
'heartless dictate after a long time' is the wordplay.
'heartless' suggests removing the centre.
'after' is a charade indicator (letters next to each other).
'a long time' becomes 'era' (a long period of time).
'dictate' with its middle removed is 'dicate'.
'dicate' put after 'era' is 'ERADICATE'.
(Other definitions for eradicate that I've seen before include "Kill" , "Extinguish, wipe out" , "Dispose of" , "Stamp out, remove all traces of" , "Completely remove" .)