Poignant (8)
I believe the answer is:
haunting
'poignant' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for haunting that I've seen before include "Visiting as a ghost" , "Frequenting a place, as a ghost might" , "Poignant, evocative" , "pursuit of ghosts" , "Willing to take chances" .)