Poignant or persistent (8)
I believe the answer is:
haunting
This clue is a double definition.
'poignant' is the first definition.
(I've seen this before)
'persistent' is the second definition.
(I know that persistent can be written as haunting)
(Other definitions for haunting that I've seen before include "Persistently troubling" , "pursuit of ghosts" , "Ghost visitation on ninth Aug" , "Willing to take chances" , "Visiting as a ghost" .)